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September 1: Start of the Liturgical year in the Eastern Orthodox Church; Ganesh Chaturthi (Hinduism, 2011); Constitution Day in Slovakia; Independence Day in Uzbekistan (1991)
More anniversaries: August 31 – September 1 – September 2
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September 2: Paryushana (begins for Digambar Jains, ends for Svetambar Jains, 2011); Democracy Day in Tibet (1960); National Day in Vietnam (1945)
- 1649 – Forces loyal to Pope Innocent X destroyed the ancient Italian city of Castro, ending the Wars of Castro.
- 1885 – White miners in Rock Springs, Wyoming, US, attacked Chinese immigrants, killing at least 28 Chinese miners and causing approximately US$150,000 in property damage.
- 1945 – On the deck of the United States Navy battleship Missouri in Tokyo Bay, representatives (pictured) from the Empire of Japan and several Allied Powers signed the Japanese Instrument of Surrender, formally ending World War II.
- 1946 – The interim government of India, headed by Jawaharlal Nehru, formed to assist the transition of India from British rule to independence.
- 1957 – President Ngo Dinh Diem of South Vietnam became the first foreign head of state to make a state visit to Australia.
More anniversaries: September 1 – September 2 – September 3
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September 3: Independence Day in Qatar (1971); Flag Day in Australia; Armed Forces Day in Republic of China (Taiwan)
- 863 – Byzantine–Arab Wars: The Byzantine Empire decisively defeated the Emirate of Melitene in the Battle of Lalakaon, beginning the era of Byzantine ascendancy.
- 1189 – Richard the Lionheart was crowned King of England in Westminster.
- 1901 – The National Flag of Australia, a Blue Ensign defaced with the Commonwealth Star and the Southern Cross, flew for the first time atop the Royal Exhibition Building in Melbourne.
- 1942 – The Holocaust: In possibly the first Jewish ghetto uprising, residents of the Łachwa Ghetto in occupied Poland, informed of the upcoming "liquidation" of the ghetto, unsuccessfully fought against their Nazi captors.
- 2004 – Russian security forces stormed a school in Beslan, North Ossetia, to force an end to the three-day hostage crisis, in which at least 334 of the over 1,100 hostages were killed (photos of victims pictured).
More anniversaries: September 2 – September 3 – September 4
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September 4: Father's Day in Australia, Fiji, Papua New Guinea and New Zealand (2011)
More anniversaries: September 3 – September 4 – September 5
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September 5: Labour Day in Canada and Labor Day in the United States (2011); Teachers' Day in India
More anniversaries: September 4 – September 5 – September 6
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September 6
- 1781 – American Revolutionary War: General Benedict Arnold led British forces to victory in the Battle of Groton Heights.
- 1943 – A group of businessmen in Monterrey, Mexico, founded the Monterrey Institute of Technology and Higher Education (pictured), now one of the largest universities in Latin America.
- 1955 – A Turkish mob attacked ethnic Greeks in Istanbul, killing at least 13 people and damaging more than 5,000 Greek-owned homes and businesses.
- 1966 – South African Prime Minister Hendrik Verwoerd, the "architect of apartheid" was stabbed to death by Dimitri Tsafendas.
- 1970 – Members of the Popular Front for the Liberation of Palestine hijacked four jet aircraft en route from Europe to New York City, landing two of them at Dawson's Field in Zerqa, Jordan, and one plane in Beirut, Lebanon.
More anniversaries: September 5 – September 6 – September 7
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September 7: Independence Day in Brazil (1822)
More anniversaries: September 6 – September 7 – September 8
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September 8: International Literacy Day; Independence Day in the Republic of Macedonia (1991)
- 1504 – David (detail pictured), a marble sculpture by Michelangelo portraying the biblical King David in the nude, was unveiled in Florence, Italy.
- 1796 – French Revolutionary Wars: The French defeated Austrian forces in Bassano, Venetia, present-day Italy.
- 1860 – The paddle steamer PS Lady Elgin was rammed by a schooner on Lake Michigan and sank, resulting in the loss of about 300 lives.
- 1941 – World War II: German forces severed the last land connection to Leningrad, beginning the Siege of Leningrad. Over 1 million of the city's civilians died from starvation before the siege ended on January 27, 1944, becoming one of the most lethal battles in world history.
- 1978 – Iranian Revolution: After the government of the Shah of Iran declared martial law in response to protests, the Iranian Army shot and killed at least 88 demonstrators in Tehran on Black Friday.
More anniversaries: September 7 – September 8 – September 9
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September 9: Independence Day in Tajikistan (1991)
More anniversaries: September 8 – September 9 – September 10
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September 10: National Day in Gibraltar (1967)
- 1547 – Anglo-Scottish Wars: English forces defeated the Scots at the Battle of Pinkie Cleugh near Musselburgh, Lothian, Scotland.
- 1813 – War of 1812: American forces led by Oliver Hazard Perry defeated the British on Lake Erie near Put-in-Bay, Ohio.
- 1937 – Led by the United Kingdom and France, nine nations met in the Nyon Conference to address international piracy in the Mediterranean Sea.
- 1946 – While riding a train to Darjeeling, Sister Teresa Bojaxhiu, later Mother Teresa (pictured), experienced what she later described as "the call within the call", directing her "to leave the convent and help the poor while living among them".
- 2008 – CERN's Large Hadron Collider, the world's largest and highest-energy particle accelerator, was first powered up beneath the Franco-Swiss border near Geneva.
More anniversaries: September 9 – September 10 – September 11
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September 11: New Year's Day in the Coptic and the Ethiopian calendars; Teachers' Day in parts of Latin America; Patriot Day and National Grandparents Day (2011) in the United States

- 1709 – An allied British-Dutch-Austrian force defeated the French at the Battle of Malplaquet, one of the bloodiest battles of the War of the Spanish Succession.
- 1857 – A brigade of the Mormon militia led a massacre of about 120 California-bound pioneers from Arkansas in present-day Mountain Meadows, Utah.
- 1914 – During the First World War, the Australian Naval and Military Expeditionary Force invaded German New Guinea, winning the Battle of Bita Paka.
- 1945 – The Japanese-run camp at Batu Lintang, Sarawak, in Borneo was liberated by the Australian 9th Division, averting the planned massacre of its 2,000-plus Allied POWs and civilian internees by four days.
- 1992 – The eye of Hurricane Iniki (pictured), the most powerful hurricane to strike the state of Hawaii and the Hawaiian Islands in recorded history, passed directly over the island of Kauai, killing six people and causing around USD$1.8 billion dollars in damage.
More anniversaries: September 10 – September 11 – September 12
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September 12: Mid-Autumn Festival (Chinese calendar, 2011); National Day in Cape Verde
More anniversaries: September 11 – September 12 – September 13
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September 13: Feast Day of Saint John Chrysostom (Western Christianity)
More anniversaries: September 12 – September 13 – September 14
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September 14: Feast of the Cross (Christianity)
More anniversaries: September 13 – September 14 – September 15
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September 15: Independence Day in Costa Rica, Guatemala, Honduras, Nicaragua and El Salvador (1821); Battle of Britain Day in the United Kingdom
More anniversaries: September 14 – September 15 – September 16
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September 16: Hari Malaysia in Malaysia (1963); Independence Day in Mexico (1810) and Papua New Guinea (1975)
- 1810 – Miguel Hidalgo, the parish priest in Dolores, Guanajuato, delivered the Grito de Dolores to his congregation, instigating the Mexican War of Independence against Spain.
- 1920 – A bomb in a horse wagon exploded in front of the J. P. Morgan building in New York City, killing 38 people and injuring 400 others.
- 1943 – World War II: Heinrich von Vietinghoff, commander of the German 10th Army, decided to withdraw his troops from Salerno, concluding the Allied invasion of Italy.
- 1990 – Construction of the Northern Xinjiang Railway was completed between Ürümqi and Alashankou, linking the railway lines of China and Kazakhstan, and adding a sizable portion to the Eurasian Land Bridge.
- 1992 – The British pound (£5 gold coin pictured) was forced out of the European Exchange Rate Mechanism on Black Wednesday, and suffered a major devaluation.
More anniversaries: September 15 – September 16 – September 17
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September 17: Oktoberfest begins (2011); Constitution Day in the United States.
More anniversaries: September 16 – September 17 – September 18
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September 18: National Day in Chile
More anniversaries: September 17 – September 18 – September 19
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September 19: Armed Forces Day in Chile; Independence Day in Saint Kitts and Nevis (1983); International Talk Like a Pirate Day
More anniversaries: September 18 – September 19 – September 20
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September 20
More anniversaries: September 19 – September 20 – September 21
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September 21: International Day of Peace; Independence Day in Armenia (1991), Belize (1981) and Malta (1964)
- 1745 – Jacobite Risings: Jacobite troops led by Charles Edward Stuart defeated the Hanoverians in Prestonpans, East Lothian, Scotland.
- 1823 – According to Joseph Smith, Jr., he was first visited by the angel Moroni, who would guide him to the golden plates that became the basis of the Book of Mormon.
- 1897 – The New York Sun, a prominent New York City newspaper, published an editorial by Francis Pharcellus Church stating, "Yes, Virginia, there is a Santa Claus", that has become a part of popular Christmas lore in the United States.
- 1953 – North Korean No Kum-Sok (pictured) defected with his MiG-15, inadvertently making Operation Moolah, an American effort to bribe Communist pilots, a success.
- 1976 – Chilean political figure Orlando Letelier was assassinated in Washington, D.C., by DINA agents.
More anniversaries: September 20 – September 21 – September 22
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September 22: Independence Day in Bulgaria (1908) and Mali (1960); Day of Baltic Unity in Latvia and Lithuania
More anniversaries: September 21 – September 22 – September 23
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September 23: National Day in Saudi Arabia (1932); Celebrate Bisexuality Day
More anniversaries: September 22 – September 23 – September 24
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September 24: Independence Day in Guinea-Bissau (1973); Heritage Day in South Africa; Republic Day in Trinidad and Tobago (1976)
More anniversaries: September 23 – September 24 – September 25
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September 25
More anniversaries: September 24 – September 25 – September 26
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September 26: European Day of Languages; Dominion Day in New Zealand (1907)
- 1580 – The Golden Hind sailed into Plymouth, England, as explorer Francis Drake completed his circumnavigation of the globe.
- 1687 – The Parthenon (pictured) in Athens was partially destroyed during an armed conflict between the Venetians under Francesco Morosini and Ottoman forces.
- 1957 – West Side Story, a musical written by Arthur Laurents, Leonard Bernstein and Stephen Sondheim and based loosely on Shakespeare's Romeo and Juliet, made its debut on Broadway.
- 1983 – The racing yacht Australia II, captained by John Bertrand, won the America's Cup, ending the New York Yacht Club's 132-year defense of the trophy.
- 2002 – MV Le Joola, a Senegalese government-owned ferry, capsized off the coast of The Gambia, resulting in the deaths of at least 1,863 people.
More anniversaries: September 25 – September 26 – September 27
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September 27: World Tourism Day
More anniversaries: September 26 – September 27 – September 28
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September 28: Rosh Hashanah (Jewish New Year) begins at sunset (2011, 5772 AM); Meskel in Ethiopia and Eritrea (2012); Statehood Day in the Czech Republic; Teachers' Day in Taiwan
More anniversaries: September 27 – September 28 – September 29
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September 29: First day of Rosh Hashanah (Jewish New Year) (2011, 5772 AM); Michaelmas
- 1829 – The Metropolitan Police (Scotland Yard pictured) of Greater London, originally headquartered in Great Scotland Yard, Westminster, was founded.
- 1957 – An explosion at the Soviet nuclear reprocessing plant Mayak released 74 to 1850 PBq of radioactive material.
- 1962 – Alouette 1, Canada's first satellite, and the first satellite constructed by a country other than the Soviet Union or the United States, was launched.
- 1963 – The University of East Anglia was founded in Norwich, England, after talk of establishing such a university in the city began as early as the 19th century.
- 2006 – Gol Transportes Aéreos Flight 1907 collided in mid-air with an Embraer Legacy business jet near Peixoto de Azevedo, Mato Grosso, Brazil, killing 154 total people, and triggering a Brazilian aviation crisis.
More anniversaries: September 28 – September 29 – September 30
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September 30: Independence Day in Botswana (1966)
More anniversaries: September 29 – September 30 – October 1
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