Mexico–United States barrier
The Mexico–United States barrier (Spanish: barrera México–Estados Unidos), also known as the border wall, is a series of vertical barriers along the Mexico–United States border intended to reduce illegal immigration to the United States from Mexico. The barrier is not a continuous structure but a series of obstructions variously classified as "fences" or "walls".
Between the physical barriers, security is provided by a "virtual fence" of sensors, cameras, and other surveillance equipment used to dispatch United States Border Patrol agents to suspected migrant crossings. In May 2011, the Department of Homeland Security (DHS) stated that it had 649 miles (1,044 km) of barriers in place. The total length of the national border is 1,954 miles (3,145 km).
The 1,954 miles (3,145 km) border between the United States and Mexico traverses a variety of terrains, including urban areas and deserts. The border from the Gulf of Mexico to El Paso, Texas, follows along the Rio Grande forming a natural barrier. The barrier is located on both urban and uninhabited sections of the border, areas where the most concentrated numbers of illegal crossings and drug trafficking have been observed in the past. These urban areas include San Diego, California, and El Paso, Texas. The fencing includes a steel fence (varying in height between 18 and 27 feet) that divides the border towns of Nogales, Arizona, in the U.S. and Nogales, Sonora, in Mexico.
97% of border apprehensions (foreign nationals who are caught being in the U.S. illegally) by the Border Patrol in 2010 occurred at the southwest border. The number of Border Patrol apprehensions declined 61% from 1,189,000 in 2005 to 723,842 in 2008 to 463,000 in 2010. The decrease in apprehensions are the result of numerous factors, including changes in U.S. economic conditions and border enforcement efforts. Border apprehensions in 2010 were at their lowest level since 1972.  Total apprehensions for 2017, 2018, and 2019 were 415,517, 521,090, 977,509 respectively. This shows a recent increase in apprehensions. And while the barrier is along the Mexico-United States border, 80% of the apprehended crossers are non-Mexican.
As a result of the barrier, there has been a significant increase in the number of people trying to cross areas that have no fence, such as the Sonoran Desert and the Baboquivari Mountains in Arizona. Such immigrants must cross fifty miles (80 km) of inhospitable terrain to reach the first road, which is located in the Tohono O'odham Indian Reservation.
The Mexico–United States border stretches from the Pacific Ocean in the west to the Gulf of Mexico in the east. Border states include the Mexican states of Baja California, Sonora, Chihuahua, Coahuila, Nuevo León, and Tamaulipas. U.S. states along the border are California, Arizona, New Mexico, and Texas.
|US state||Border length||Mexican states|
|California||140.4 miles (226.0 km)||Baja California|
|Arizona||372.5 miles (599.5 km)||Baja California, Sonora|
|New Mexico||179.5 miles (288.9 km)||Sonora, Chihuahua|
|Texas||1,241.0 miles (1,997.2 km)||Chihuahua, Coahuila, Nuevo León, Tamaulipas|
|Total||1,933.4 miles (3,111.5 km)||-|
The current boundary was largely established in 1853. The first international bridge was the Brownsville & Matamoros International Bridge built in 1910. The first barrier built by the U.S. was between 1909-1911; the first barrier built by Mexico was likely in 1918, and barriers were extended in the 1920s and 1940s.
U.S. President George H. W. Bush approved the initial 14 miles of fencing along the San Diego–Tijuana border. Construction began on this section in 1990 and was completed by 1993. Further barriers were built from 1994 under the presidency of Bill Clinton as part of three larger operations to taper transportation of illegal drugs manufactured in Latin America and immigration: Operation Gatekeeper in California, Operation Hold-the-Line in Texas, and Operation Safeguard in Arizona. Clinton signed the Illegal Immigration Reform and Immigrant Responsibility Act of 1996, which authorized further barriers and the reinforcement of Bush's fence. The majority of the border barriers built in the 1990s were made out of leftover helicopter landing mats from the Vietnam War.
The Real ID Act, signed into law by President George W. Bush on May 11, 2005, attached a rider to a supplemental appropriations bill funding the wars in Iraq and Afghanistan, which went into effect in May 2008:
Notwithstanding any other provision of law, the Secretary of Homeland Security shall have the authority to waive all legal requirements such Secretary, in such Secretary's sole discretion, determines necessary to ensure expeditious construction of the barriers and roads.
In 2005, there were 75 miles of fencing along the border. In 2005, the border-located Laredo Community College obtained a 10-foot fence built by the United States Marine Corps. The structure led to a reported decline in border crossings on to the campus. U.S. Representative Duncan Hunter of California proposed a plan on November 3, 2005, calling for the construction of a reinforced fence along the entire United States–Mexico border. This would also have included a 100-yard (91 m) border zone on the U.S. side. On December 15, 2005, Congressman Hunter's amendment to the Border Protection, Anti-terrorism, and Illegal Immigration Control Act of 2005 (H.R. 4437) passed in the House, but the bill did not pass the Senate. This plan called for mandatory fencing along 698 miles (1,123 km) of the 1,954-mile (3,145-kilometer)-long border. On May 17, 2006, the U.S. Senate proposed the Comprehensive Immigration Reform Act of 2006 (S. 2611), which would include 370 miles (600 km) of triple-layered fencing and a vehicle fence, but the bill died in committee.
Secure Fence Act of 2006
The Secure Fence Act of 2006, signed into law on October 26, 2006, by President George W. Bush authorized and partially funded the potential construction of 700 miles (1,125 km) of physical fence/barriers along the Mexican border. The bill passed with supermajorities in both chambers. Secretary of Homeland Security Michael Chertoff announced that an eight-month test of the virtual fence he favored would precede any construction of a physical barrier.
The government of Mexico and ministers of several Latin American countries condemned the plans. Governor of Texas Rick Perry expressed his opposition, saying that the border should be more open and should support safe and legal migration with the use of technology. The barrier expansion was opposed by a unanimous vote by the Laredo, Texas, City Council. Laredo Mayor Raul G. Salinas said that the bill would devastate Laredo. He stated "These are people that are sustaining our economy by forty percent, and I am gonna close the door on them and put [up] a wall? You don't do that. It's like a slap in the face." He hoped that Congress would revise the bill to better reflect the realities of life on the border.
Secretary Chertoff exercised his waiver authority on April 1, 2008, to "waive in their entirety" the Endangered Species Act, the Migratory Bird Treaty Act, the National Environmental Policy Act, the Coastal Zone Management Act, the Clean Water Act, the Clean Air Act, and the National Historic Preservation Act to extend triple fencing through the Tijuana River National Estuarine Research Reserve near San Diego. By January 2009, U.S. Customs and Border Protection and Homeland Security had spent $40 million on environmental analysis and mitigation measures aimed at blunting any possible adverse impact that the fence might have on the environment. On January 16, 2009, DHS announced it was pledging an additional $50 million for that purpose, and signed an agreement with the U.S. Department of the Interior for utilization of the additional funding. In January 2009, U.S. Customs and Border Protection reported that it had more than 580 miles (930 km) of barriers in place.
On March 16, 2010, DHS announced that there would be a halt to expand the virtual fence beyond two pilot projects in Arizona. Contractor Boeing Corporation had numerous delays and cost overruns. Boeing had initially used police-dispatching software that was unable to process all of the information coming from the border. The $50 million of remaining funding would be used for mobile surveillance devices, sensors, and radios to patrol and protect the border. At the time, DHS had spent $3.4 billion on border fences and had built 640 miles (1,030 km) of fences and barriers as part of the Secure Border Initiative.
In May 2011, President Barack Obama stated that the wall was "basically complete", with 649 miles (1,044 km) of 652 planned miles of barrier constructed. Of this, vehicle barriers comprised 299 miles (481 km) and pedestrian fence 350 miles (560 km). Obama stated that:
We have gone above and beyond what was requested by the very Republicans who said they supported broader reform as long as we got serious about enforcement. All the stuff they asked for, we've done. But ... I suspect there are still going to be some who are trying to move the goal posts on us one more time. They'll want want a higher fence. Maybe they'll need a moat. Maybe they want alligators in the moat.[a] They'll never be satisfied. And I understand that. That's politics.
The Republican Party's 2012 platform stated that "The double-layered fencing on the border that was enacted by Congress in 2006, but never completed, must finally be built." The Secure Fence Act's costs were estimated at $6 billion, more than the Customs and Border Protection's entire annual discretionary budget of $5.6 billion. The Washington Office on Latin America noted in 2013 that the cost of complying with the Secure Fence Act's mandate was the reason that it had not been completely fulfilled.
A 2016 report by the Government Accountability Office confirmed that the government had completed the fence by 2015. A 2017 report noted that "In addition to the 654 miles of primary fencing, [Customs and Border Protection] has also deployed additional layers of pedestrian fencing behind the primary border fencing, including 37 miles of secondary fencing and 14 miles of tertiary fencing."
Throughout his 2016 presidential campaign, Donald Trump called for the construction of a much larger and fortified border wall, claiming that if elected, he would "build the wall and make Mexico pay for it". Mexican President Enrique Peña Nieto maintained that his country would not pay for the wall. On January 25, 2017, the Trump administration signed Executive Order 13767, which formally directed the US government to begin attempting to construct a border wall using existing federal funding, although construction did not begin at this time because a formal budget had not been developed.
Trump's campaign promise has faced a host of legal and logistical challenges since. In March 2018, the Trump administration secured $1.6 billion from Congress for projects at the border for existing designs of approximately 100 miles of new and replacement walls. From December 22, 2018, to January 25, 2019, the federal government was partially shut down because of Trump's declared intention to veto any spending bill that did not include $5 billion in funding for a border wall.
On May 24, 2019, federal Judge Haywood Gilliam in the Northern District of California granted a preliminary injunction preventing the Trump administration from redirecting funds under the national emergency declaration issued earlier in the year to fund a planned wall along the border with Mexico. The injunction applies specifically to money the administration intended to allocate from other agencies and limits wall construction projects in El Paso and Yuma. On June 28, Gilliam blocked the reallocation of $2.5 billion of funding from the Department of Defense to the construction of segments of the border wall categorized as high priority by the Trump administration (spanning across Arizona, California and New Mexico). The decision was upheld five days later by a majority in the Ninth Circuit Appeals Court but was overturned by the U.S. Supreme Court on July 26. On September 3, Secretary of Defense Mark Esper authorized the use of $3.6 billion in military construction funding for 175 miles of the barrier. The House and Senate have twice voted to terminate Trump's emergency declaration, but the president vetoed both resolutions. In October, a lawsuit filed in El Paso County produced a ruling that the emergency declaration was unlawful, as it fails to meet the National Emergencies Act's definition of an emergency. On December 10, a federal judge in the case blocked the use of the funding, but on January 8, 2020, a federal appeals court granted a stay of the ruling, freeing $3.6 billion for the wall.
As of August 2019[update], the Trump administration's barrier construction had been limited to replacing sections that were in need of repair or outdated, with 60 miles of replacement wall built in the Southwest since 2017. As of September 12, 2019, the Trump administration plans for "Between 450 and 500 miles (724–806 kilometers) of fencing along the nearly 2,000-mile (3,218-kilometer) border by the end of 2020" with an estimated total cost of $18.4 billion. Privately owned land adjacent to the border would have to be acquired by the U.S. government to be built upon.
On June 23, Trump visited Yuma, Arizona, for a campaign rally commemorating the completion of 200 miles (320 km) of the wall. U.S. Customs and Border Protection confirmed that almost all of this was replacement fencing. By December 7, 2020, 423 miles (681 km) had been built, the bulk of it replacing outdated or dilapidated existing barriers.
Contractors and independent efforts
As of February 2019, contractors were preparing to construct $600 million worth of replacement barriers along the south Texas Rio Grande Valley section of the border wall, approved by Congress in March 2018. In mid-April 2019, former Kansas Secretary of State Kris Kobach visited Coolidge, Arizona, to observe a demonstration by Fisher Industries of how it would build a border fence. The company maintained that it could erect 218 miles of the barrier for $3.3 billion and be able to complete it in 13 months. Spin cameras positioned atop the fence would use facial-recognition technology, and underground fiber optic cables could detect and differentiate between human activity, vehicles, tunneling, and animals as distant as 40 feet away. The proposed barrier would be constructed with 42 miles near Yuma and 91 miles near Tucson, Arizona, 69 miles near El Paso, Texas, and 15 miles near El Centro, California—reportedly costing $12.5 million per mile. In April 2019, U.S. Senator Bill Cassidy said that he traveled with the group of politicians and administration officials over the Easter recess to Coolidge (120 miles north of the Mexico border) because he felt that insufficient barrier and border enhancements had been erected since Trump became president. U.S. senator Kevin Cramer was also there, promoting Fisher Industries, which demonstrated the construction of a 56-foot fence in Coolidge.
A private organization founded by military veteran Brian Kolfage called "We Build the Wall" raised over $20 million beginning in 2018, with President Trump's encouragement and with leadership from Kobach and Steve Bannon. Over the 2019 Memorial Day weekend, the organization constructed a 1/2 to 1-mile "weathered steel" bollard fence near El Paso on private land adjoining the US–Mexico border using $6–8 million of the donated funds. Kolfage's organization says it has plans to construct further barriers on private lands adjoining the border in Texas and California. On December 3, 2019, a Hidalgo County judge ordered the group to temporarily halt all construction because of its plans to build adjacent to the Rio Grande, which a lawyer for the National Butterfly Center argues would create a flooding risk. On January 9, 2020, a federal judge lifted an injunction, allowing a construction firm to move forward with the 3 mile project along the Rio Grande. This ended a month long court battle with both the Federal Government and the National Butterfly Center which both tried to block construction efforts.
Research at Texas A&M University and Texas Tech University indicates that the wall, like border walls in general, is unlikely to be effective at reducing illegal immigration or movement of contraband. In mid-April, 2019, U.S. Senator Martha McSally said that a barrier will not resolve the border crisis. Authors of books on the effectiveness have said that aside from the human crossings, drugs among other things will still be making their way to the United States illegally. However, US Customs and Border Protection has frequently called for more physical barriers on the Mexico–United States border, citing their efficacy.
On January 27, 2008, a Native American human rights delegation in the United States, which included Margo Tamez (Lipan Apache-Jumano Apache) and Teresa Leal (Opata-Mayo) reported the removal of the official International Boundary obelisks of 1848 by the U.S. Department of Homeland Security in the Las Mariposas, Sonora-Arizona sector of the Mexico–U.S. border. The obelisks were moved southward approximately 20 m (70 ft), onto the property of private landowners in Sonora, as part of the larger project of installing the 18-foot (5.5 m) steel barrier wall.
The proposed route for the border fence would divide the campus of the University of Texas at Brownsville into two parts, according to Antonio N. Zavaleta, a vice president of the university. There have been campus protests against the wall by students who feel it will harm their school. In August 2008, UT-Brownsville reached an agreement with the U.S. Department of Homeland Security for the university to construct a portion of the fence across and adjacent to its property. On August 20, 2008, the university sent out a request for bids for the construction of a 10-foot (3.0 m) high barrier that incorporates technology security for its segment of the border fence project. The southern perimeter of the UT-Brownsville campus will be part of a laboratory for testing new security technology and infrastructure combinations. The border fence segment on the campus was substantially completed by December 2008.
Santa Ana National Wildlife Refuge
On August 1, 2018, the chief of the Border Patrol's Rio Grande Valley sector indicated that although Starr County was his first priority for a wall, Hidalgo County's Santa Ana National Wildlife Refuge had been selected instead for initial construction, because its land was owned by the government.
National Butterfly Center
The proposed border wall has been described as a "death sentence" for the American National Butterfly Center, a privately operated outdoor butterfly conservatory that maintains a significant amount of land in Mexico. Filmmaker Krista Schlyer, part of an all-woman team creating a documentary film about the butterflies and the border wall, Ay Mariposa, estimates that construction would put "70 percent of the preserve habitat" on the Mexican side of the border. In addition to concerns about seizure of private property by the federal government, center employees have also noted the local economic impact. The center's director has stated that "environmental tourism contributes more than $450m to Hidalgo and Starr counties."
In early December 2018, a challenge to wall construction at the National Butterfly Center was rejected by the U.S. Supreme Court. According to the San Antonio Express News, "the high court let stand an appeals ruling that lets the administration bypass 28 federal laws", including the Endangered Species Act, the Safe Drinking Water Act and the Native American Graves Protection and Repatriation Act.
In 2006, the Mexican government vigorously condemned the Secure Fence Act of 2006. Mexico has also urged the U.S. to alter its plans for expanded fences along their shared border, saying that it would damage the environment and harm wildlife.
In 2012, Enrique Peña Nieto was campaigning in Tijuana at the Playas de Monumental, less than 600 yards (550 m) from the U.S.–Mexico border adjacent to Border Field State Park. In one of his speeches he criticized the U.S. government for building the barriers and asked for them to be removed, referencing President Ronald Reagan's "Tear down this wall!" speech from Berlin in 1987.
Between 1994 and 2007, there were around 5,000 migrant deaths along the Mexico–United States border, according to a document created by the Human Rights National Commission of Mexico, also signed by the American Civil Liberties Union. Between 43 and 61 people died trying to cross the Sonoran Desert from October 2003 to May 2004; three times that of the same period the previous year. In October 2004, the Border Patrol announced that 325 people had died crossing the entire border during the previous 12 months. Between 1998 and 2004, 1,954 persons are officially reported to have died along the Mexico–U.S. border. Since 2004, the bodies of 1,086 migrants have been recovered in the southern Arizona desert.
U.S. Border Patrol Tucson Sector reported on October 15, 2008, that its agents were able to save 443 illegal immigrants from certain death after being abandoned by their smugglers. The agents also reducing the number of deaths by 17% from 202 in 2007 to 167 in 2008. Without the efforts of these agents, hundreds more could have died in the deserts of Arizona. According to the same sector, border enhancements like the wall have allowed the Tucson Sector agents to reduce the number of apprehensions at the borders by 16% compared with 2007.
In April 2008, the Department of Homeland Security announced plans to waive more than 30 environmental and cultural laws to speed construction of the barrier. Despite claims from then Homeland Security Chief Michael Chertoff that the department would minimize the construction's impact on the environment, critics in Arizona, New Mexico, and Texas, asserted that the fence endangered species and fragile ecosystems along the Rio Grande. Environmentalists expressed concern about butterfly migration corridors and the future of species of local wildcats, the ocelot, the jaguarundi, and the jaguar.
By August 2008, more than 90% of the southern border in Arizona and New Mexico had been surveyed. In addition, 80% of the California–Mexico border has been surveyed. About 100 species of plants and animals, many already endangered, are threatened by the wall, including the jaguar, ocelot, Sonoran pronghorn, Mexican wolf, a pygmy owl, the thick-billed parrot, and the Quino checkerspot butterfly. According to Scott Egan of Rice University, a wall can create a population bottleneck, increase inbreeding, and cut off natural migration routes and range expansion.
An initial 75-mile (121 km) wall for which U.S. funding has been requested on the nearly 2,000-mile (3,200 km) mile border would pass through the Tijuana Slough National Wildlife Refuge in California, the Santa Ana National Wildlife Refuge and Lower Rio Grande Valley National Wildlife Refuge in Texas, and Mexico's Cabeza Prieta National Wildlife Refuge and El Pinacate y Gran Desierto de Altar Biosphere Reserve, which is a UNESCO World Heritage Site that the U.S. is bound by global treaty to protect. The U.S. Customs and Border Protection plans to build the wall using the Real ID Act to avoid the process of making environmental impact statements, a strategy devised by Chertoff during the Bush administration. Reuters said, "The Real ID Act also allows the secretary of Homeland Security to exempt CBP from adhering to the Endangered Species Act", which would otherwise prohibit construction in a wildlife refuge.
- Mexico–United States border
- List of Mexico–United States border crossings
- United States Border Patrol interior checkpoints
- Build the Wall, Enforce the Law Act of 2018
- Roosevelt Reservation
- List of walls
- Open border
- Tortilla Wall
- Border barrier
- Separation barrier
- Guatemala–Mexico border
- Israeli West Bank barrier
- Egypt–Israel barrier
- Hungarian border barrier
- Garcia, Michael John (November 18, 2016). Barriers Along the U.S. Borders: Key Authorities and Requirements (PDF). Washington, DC: Congressional Research Service. Retrieved December 9, 2016.
- Chaichian, Mohammad. 2014. Empires and Walls: Globalization, Migration, and Colonial Domination (Brill, pp. 175-235) https://www.amazon.com/Empires-Walls-Globalization-Migration-Domination/dp/1608464229
- "The Border Fence". NOW on PBS.
- Farley, Robert (May 16, 2011). "Obama says the border fence is 'now basically complete'". Politifact. Retrieved July 27, 2019.
- "The Wall: How long is the U.S.–Mexico border?". USA TODAY. Retrieved January 13, 2019.
- Sapp, Lesley (July 2011). Apprehensions by the U.S. Border Patrol: 2005–2010. Office of Immigration Studies, United States Department of Homeland Security (Washington, D.C.) Retrieved November 18, 2011
- Peter Holley, "Trump proposes a border wall. But there already is one, and it gets climbed over", Washington Post (April 2, 2016).
- "U.S. Homeland Security secretary has 'elbow room' on building border wall". Homeland Preparedness News. April 5, 2017. Retrieved April 21, 2017.
- "Southwest Border Migration FY 2020". Department of Homeland Security. February 11, 2020. Retrieved February 15, 2020.
- "What's happening at the U.S.–Mexico border in 5 charts". Pew Research Center. Retrieved April 8, 2020.
- "Border Desert Proves Deadly For Mexicans". The New York Times. May 23, 2004.
- One Nation, Under Fire High Country News, February 19, 2007.
- John, Rachel St. "The Raging Controversy at the Border Began With This Incident 100 Years Ago". Smithsonian Magazine.
- "This is how much of the border wall has been built so far". WSYM. January 19, 2019. Retrieved April 8, 2019.
- Chad C. Haddal, et al., Border Security: Barriers Along the U.S International Border, Congressional Research Service (March 16, 2009).
- McPhail, Weldon, Assistant Director, Administration of Justice Issues, Dennise R. Stickley, Evaluator, David P. Alexander, Social Science Analyst: Washington, DC, Appendix I:1; Michael P. Dino, Evaluator-in-Charge, James R. Russell, Evaluator: LA Regional Office, Appendix I:2; "Border Control: Revised Strategy Is Showing Some Positive Results". Subcommittee on Information, Justice, Transportation and Agriculture, Committee on Government Operations, House of Representatives, December 29, 1994.
- Pike, John. "Operation Gatekeeper: Operation Hold-the-Line: Operation Safeguard".
- Gamboa, Suzanne (September 15, 2006). "House Approves U.S.–Mexican Border Fence". ISSN 0190-8286. Retrieved August 7, 2019.
- "Laredo border fence offers possible comparisons". Valley Morning Star. Archived from the original on February 28, 2019. Retrieved July 29, 2019.
- "Hunter proposal for strategic border fencing passes House". 2005. Archived from the original on October 6, 2006. Retrieved October 10, 2006.
- "109th Congress Public Law 367". gpo.gov. Retrieved January 15, 2017.
- "ABC News: Bush Signs U.S.–Mexico Border Fence Bill". Archived from the original on November 21, 2007. Retrieved October 26, 2006.
- "Rechaza gobernador de Texas muro fronterizo" (in Spanish). Retrieved March 7, 2006.
- James Rowley, "U.S.–Mexico Border Fence Plan Will Be 'Revisited' By Congress," Bloomberg January 17, 2007.
- Kahn, Carrie (July 8, 2006). "Immigration Debate Divides Laredo". NPR. Retrieved September 28, 2007.
- "Billing Code 4410-10 Department of Homeland Security" (PDF).
Thomas M. Wilson; Hastings Donnan (June 11, 2012). A Companion to Border Studies. John Wiley & Sons. p. 379. ISBN 978-1-4051-9893-6.
- Archibold, Randal C. (January 17, 2009). "Border Plan Will Address Harm Done at Fence Site". The New York Times. Retrieved March 27, 2010.
- U.S. Plans Border 'Surge' Against Any Drug Wars The New York Times, January 7, 2009.
- Hsu, Spencer S. (March 16, 2010). "Work to cease on 'virtual fence' along U.S.–Mexico border". The Washington Post.
- Shear, Michael D.; Davis, Julie Hirschfeld (October 1, 2019). "Shoot Them in the Legs, Trump Suggested: Inside His Border War". The New York Times. Retrieved October 1, 2019.
- "2012 Republican Party Platform" (PDF). The Republican National Convention. Retrieved September 24, 2012.
- Weisman, Jonathan (September 30, 2006). "With Senate Vote, Congress Passes Border Fence Bill". The Washington Post.
- "Budget-in-Brief" (PDF). United States Department of Homeland Security. 2006.
- Isaacson, Adam (2013). "A budget-busting proposal in the Republican platform". Border Facts: Separating Rhetoric from Reality. Retrieved October 2, 2019.
- Annie Linskey, In 2006, Democrats were saying 'build that fence!', Boston Globe (January 27, 2017).
- GAO February 2017, p. 9.
- "Donald Trump: 'We will build Mexico border wall'". BBC News. January 26, 2016. Retrieved January 26, 2016.
- "How realistic is Donald Trump's Mexico wall?". BBC News. January 26, 2016. Retrieved January 26, 2016.
- "Quien se mueve sí sale en la foto". Excelsior (in Spanish). March 7, 2016. Retrieved January 25, 2017.
- Davis, Julie Hirschfeld (January 25, 2017). "Trump Orders Mexican Border Wall to Be Built and Is Expected to Block Syrian Refugees". The New York Times. ISSN 0362-4331. Retrieved January 26, 2017.
- Jack Goodman; Micah Luxen (January 5, 2019). "Trump's wall: How much has been built so far?". BBC.com. Retrieved February 17, 2019.
- "Government Shutdown 2018: Latest Updates & Reaction". Politico. December 27, 2018. Retrieved December 28, 2018.
- Del Real, Jose (May 24, 2019). "Federal Judge Blocks Part of Trump's Plan to Build Border Wall". The New York Times. Retrieved May 25, 2019.
- "U.S. judge expands ban on constructing sections of Trump's border wall in Calif., Ariz., while also clearing way for quick appeal". The Washington Post. Retrieved June 28, 2019.
- Kanno-Youngs, Zolan (July 3, 2019). "Appeals Court Upholds Ruling Blocking Trump From Using Defense Funds for Border Wall". The New York Times. Retrieved July 5, 2019.
- Liptak, Adam (July 26, 2019). "Supreme Court Lets Trump Proceed on Border Wall". The New York Times. New York City. Retrieved July 28, 2019.
- "Read: Letter announcing decision to divert military funds for Trump's border wall". CNN. September 3, 2019. Retrieved September 3, 2019.
- Cohen, Zachary; Browne, Ryan (September 3, 2019). "Pentagon diverts $3.6 billion in military construction funds to build Trump's border wall". CNN. Retrieved September 3, 2019.
- Samuels, Brett (October 15, 2019). "Trump again vetoes resolution blocking national emergency for border wall". TheHill. Retrieved October 16, 2019.
- Alvarez, Priscilla (October 11, 2019). "Federal judge says Trump's use of emergency funds to build wall is unlawful". CNN. Retrieved October 12, 2019.
- Alvarez, Priscilla; Kelly, Caroline (December 10, 2019). "Federal judge blocks use of billions of dollars in Pentagon funds to build border wall". CNN. Retrieved December 14, 2019.
- Alvarez, Priscilla; LeBlanc, Paul (January 8, 2020). "Appeals court allows use of $3.6 billion in military funds for border wall". CNN. Retrieved January 8, 2020.
- Giaritelli, Anna (July 20, 2019). "Trump has not built a single mile of new border fence after 30 months in office". Washington Examiner. Retrieved July 23, 2019.
- Valverde, Miriam (August 30, 2019). "Border wall under way? It's replacement fencing". PolitiFact. Retrieved September 2, 2019.
- "450 miles of border wall by next year? In Arizona, it starts". AP News. September 12, 2019. Retrieved December 20, 2019.
- Norman, Greg (August 26, 2019). "Border Patrol releases drone footage showing miles of 'new wall system' being built". Fox News. Retrieved September 2, 2019.
- Miroff, Nick; Dawsey, Josh (September 19, 2019). "Trump officials considering plan to divert billions of dollars in additional funds for border barrier". The Washington Post. Retrieved September 22, 2019.
- Lemire, Jonathan (June 23, 2020). "Watch: Trump visits Arizona to mark construction of 200 miles of wall along U.S.-Mexico border". PBS NewsHour. Retrieved June 24, 2020.
- Eltohamy, Farah (June 23, 2020). "Trump in Yuma to mark 216 miles of border wall, still a work in progress". Cronkite News - Arizona PBS. Retrieved July 16, 2020.
- "Border Wall System". U.S. Customs and Border Protection. Retrieved November 18, 2020.
- Spagat, Elliot; Mascaro, Lisa (March 23, 2018). "AP News Guide: Trump gets wishes on border wall—sort of". AP News. Retrieved April 10, 2019.
- Merchant, Nomaan (February 4, 2019). "US prepares to start building portion of Texas border wall". AP NEWS. Retrieved February 8, 2019.
- Kris Kobach and fellow border hawks join Army Corps in Arizona to see company's border fence proposal, Washington Examiner, Anna Giaritelli, April 16, 2019. Retrieved April 19, 2019.
- ND company demonstrates building border wall, Minot Daily News, Eloise Ogden, April 19, 2019. Retrieved April 19, 2019.
- Catherine E. Shoichet, Leyla Santiago, Devon M. Sayers, Jeremy Diamond and Rosa Flores, "A private group says it's started building its own border wall using millions donated in GoFundMe campaign", CNN, 28 May 2019
- "Private group unveils crowd-funded border wall despite legal hurdles". abc news. Retrieved May 30, 2019.
- Camacho, Marian, "Construction on private border wall continues", KOB, 30 May 2019
- Armus, Teo (December 4, 2019). "Right-wing group must stop building private border wall in South Texas, judge says in temporary order". The Washington Post. Retrieved December 4, 2019.
- Langford, Cameron (January 10, 2020). "Judge clears way for construction of private US–Mexico border fence". Tucson Sentinel. Retrieved January 10, 2020.
- Gabbatiss, Josh (February 17, 2019). "Trump's border wall will not work 'no matter how high', scientists warn". The Independent. Retrieved April 10, 2019.
- Wall supporter Martha McSally says more barrier won't end border crisis, Washington Examiner, Anna Giaritelli, April 17, 2019. Retrieved April 19, 2019.
- Felbab-Brown, Vanda (August 22, 2017). The Wall: The Real Costs of a Barrier between the United States and Mexico. Brookings Institution Press. ISBN 978-0-8157-3295-2.
- "Border Patrol Makes Its Case For An Expanded 'Border Barrier'". NPR. January 11, 2019. Retrieved April 8, 2019.
- O'odham tell U.N. rapporteur of struggles Indian Country, October 31, 2005
- As Border Crackdown Intensifies, A Tribe Is Caught in the Crossfire, Washington Post, September 15, 2006
- "Nogales Residents Say US is Building Border Wall on Mexico's Land – the narcosphere". Archived from the original on May 6, 2008. Retrieved April 29, 2008.
- "Monuments, Manifest Destiny, and Mexico". August 15, 2016.
- "Nogales Residents Say US is Building Border Wall on Mexico's Land". Narcosphere.narconews.com. Archived from the original on May 15, 2009. Retrieved March 27, 2010.
- "Some Texans Fear Border Fence Will Sever Routine of Daily Life", New York Times, June 20, 2007
- Bids Requested for Fence Upgrade The University of Texas at Brownsville and Texas Southmost College, August 20, 2008
- Sieff, Kevin (December 12, 2008). "Friendly Fence". Brownsville Herald. Archived from the original on July 22, 2012. Retrieved March 27, 2010.
- Wasson, Erik (February 9, 2019). "Trump border wall could split SpaceX's Texas launchpad in two". Bloomberg. Retrieved March 31, 2019 – via Los Angeles Times.
- del Bosque, Melissa (August 4, 2017). "National Butterfly Center Founder: Trump's Border Wall Prep 'Trampling on Private Property Rights'". The Texas Observer. Retrieved December 18, 2018.
- Gilbert, Samuel (December 13, 2018). "'Death sentence': butterfly sanctuary to be bulldozed for Trump's border wall". The Guardian. ISSN 0261-3077. Retrieved December 18, 2018.
- Foster-Frau, Silvia (December 6, 2018). "Bulldozers to soon plow through National Butterfly Center for Trump's border wall". San Antonio Express News. Retrieved December 18, 2018.
- "Ay Mariposa Film". Indiegogo. Retrieved December 18, 2018.
- Heimbuch, Jaymi (December 11, 2018). "All-women film team takes on border wall on behalf of all at-risk wildlife". Mother Nature Network. Retrieved December 18, 2018.
- Guerra, Luciano (December 17, 2018). "I voted for Trump. Now his wall may destroy my butterfly paradise". Perspective. Washington Post. Retrieved April 10, 2019.
- "US border fences 'an eco-danger'". BBC News. July 31, 2007. Retrieved March 27, 2010.
- "Borders | The Fence : The Semantics of a Border Barrier". apps.cndls.georgetown.edu. Retrieved January 7, 2019.
- El Universal de Mexico (Spanish) Retrieved November 9, 2007
- "Border deaths of illegal migrants cause concern".
- New Matilda The Long Graveyard
- "CBP Border Patrol Announces Fiscal Year 2008 Achievements for Tucson Sector". Archived from the original on November 30, 2009.
- "Tucson Sector Makes Significant Gains in 2008". Archived from the original on July 22, 2012.
- Marosi, Richard; Gaouette, Nicole (April 2, 2008). "Border fence will skirt environmental laws". Latimes.com. Archived from the original on April 14, 2008. Retrieved March 27, 2010.
- Border Wall Could Threaten Northern Jaguar July 5, 2017
- "U.S. Customs and Border Protection". Cbp.gov. September 28, 2005. Retrieved March 27, 2010.
- Ruth, David (August 3, 2017). "Border wall would put more than 100 endangered species at risk, says expert". Phys.org. Science X Network. Retrieved August 4, 2017.
- Greenwald, Noah; et al. (May 2017). "A Wall In the Wild" (PDF). Center for Biological Diversity. Retrieved August 3, 2017.
- Barclay, Eliza; Frostenson, Sarah (July 26, 2017). "The ecological disaster that is Trump's border wall: a visual guide". Vox. Vox Media. Retrieved August 6, 2017.
- Uhlemann, Sarah (August 3, 2017). "Commentary: Trump's border wall endangers wildlife refuges, World Heritage sites". San Diego Union Tribune. Retrieved August 6, 2017.
- Flitter, Emily (July 21, 2017). "Trump administration seeks to sidestep border wall environmental study: sources". Reuters. Thomson Reuters. Retrieved August 4, 2017.
- Chaichian, Mohammad. 2014. Empires and Walls: Globalization, Migration, and Colonial Domination (Brill, pp. 175-235) https://www.amazon.com/Empires-Walls-Globalization-Migration-Domination/dp/1608464229
- "Border Security: Barriers Along the U.S. International Border". Congressional Research Service.
- Gerstein, Josh (July 26, 2019). "Supreme Court gives Trump go-ahead on border wall". Politico.
- The High Cost and Diminishing Returns of a Border Wall
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