20th century in the United States

The 20th century in the United States refers to the period in the United States from 1901 through 2000 in the Gregorian calendar. For information on this period, see:

• Category:20th century in the United States
• History of the United States series:
  • History of the United States (1865–1918)
  • History of the United States (1918–1945)
  • History of the United States (1945–1964)
  • History of the United States (1964–1980)
  • History of the United States (1980–1991)
  • History of the United States (1991–present)
• Timeline of the United States