United States of America
The United States of America, also known as the United States or America, is a country primarily located in North America. It is a federal republic consisting of 50 states and a federal capital district, Washington, D.C. The 48 contiguous states border Canada to the north and Mexico to the south, with the semi-exclave of Alaska in the northwest and the archipelago of Hawaii in the Pacific Ocean. The United States also asserts sovereignty over five major island territories and various uninhabited islands in Oceania and the Caribbean.
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Rulers
- US presidents
- George Washington 1789 – 1797, John Adams 1797 – 1801, Thomas Jefferson 1801 – 1809, James Madison 1809 – 1817, James Monroe 1817 – 1825, John Quincy Adams 1825 – 1829, Andrew Jackson 1829 – 1837, Martin Van Buren 1837 – 1841, John Tyler 1841 – 1845, James K. Polk 1845 – 1849, Zachary Taylor 1849 – 1850, Millard Fillmore 1850 – 1853, Franklin Pierce 1853 – 1857, James Buchanan 1857 – 1861, Abraham Lincoln 1861 – 1865, Andrew Johnson 1865 – 1869, Ulysses S. Grant 1869 – 1877, Rutherford B. Hayes 1877 – 1881, Chester A. Arthur 1881 – 1885, Grover Cleveland 1885 – 1889, Benjamin Harrison 1889 – 1893, Grover Cleveland 1893 – 1897, William McKinley 1897 – 1901, Theodore Roosevelt 1901 – 1909, William Howard Taft 1909 – 1913, Woodrow Wilson 1913 – 1921, Warren G. Harding 1921 – 1923, Calvin Coolidge 1923 – 1929, Herbert Hoover 1929 – 1933, Franklin D. Roosevelt 1933 – 1945, Harry S. Truman 1945 – 1953, Dwight D. Eisenhower 1953 – 1961, John F. Kennedy 1961 – 1963, Lyndon B. Johnson 1963 – 1969, Richard Nixon 1969 – 1974, Gerald Ford 1974 – 1977, Jimmy Carter 1977 – 1981, Ronald Reagan 1981 – 1989, George H. W. Bush 1989 – 1993, Clinton 1993 – 2001, G. W. Bush 2001 – 2009, Obama since 2009
Events on its territory
- 1776 US Declaration of Independence
- 1787 US Constitution
- 1803 Louisiana Purchase
- 1838–1839 Trail of Tears
- 1844 Morse telegraph line
- 1846 First public demonstration of ether anaesthesia
- 1848 California Gold Rush
- 1863 Emancipation Proclamation
- 1869 First transcontinental railroad
- 1876 Invention of the telephone
- 1879 Edison's incandescent lamp
- 1898 Spanish–American War
- 1903 Wright brothers' first flight
- 1906 San Francisco earthquake
- 1913 Ford's moving assembly line
- 1914 Death of Martha, the last passenger pigeon
- 1918–1920 Spanish flu pandemic
- 1918 Death of the last Carolina parakeet
- 1927 The Jazz Singer and the talkies
- 1929 Wall Street Crash and the Great Depression
- c. 1930–1936 Dust Bowl
- 1941 Attack on Pearl Harbor
- 1945 Founding of the United Nations
- 1945 ENIAC, the first general-purpose electronic computer
- 1945–1946 Nuremberg trials
- 1947 Invention of the transistor
- 1949 Founding of NATO
- 1950–1953 Korean War
- 1955 Salk polio vaccine declared safe
- 1956 Dartmouth workshop: AI is born
- 1963 March on Washington
- 1964 First Shinkansen high-speed railway
- 1964 Tokyo Olympics
- 1969 Moon landing
- 1971 First commercial microprocessor
- 1976 Hōkūleʻa sails to Tahiti
- 1977 Star Wars is released
- 1980 Eruption of Mount St. Helens
- 1983 Birth of the Internet: ARPANET adopts TCP/IP
- 1990 Launch of the Hubble Space Telescope
- 1997 Deep Blue defeats Kasparov
- 2001 September 11 attacks
- 2003 Human genome sequenced
- 2007 Apple unveils the iPhone
- 2008 Global financial crisis