1774: Primer Congreso Continental. 1775: el Congreso declara la guerra a Inglaterra. 1776: Declaración de Independencia. 1783: reconocimiento de la independencia por la Paz de París. 1787: Constitución federal. 1861-1865: Guerra de Secesión.
| Presidentes | |
|---|---|
| 1789 | George Washington |
| 1797 | John Adams |
| 1801 | Thomas Jefferson |
| 1809 | James Madison |
| 1817 | James Monroe |
| 1825 | John Quincy Adams |
| 1829 | Andew Jackson |
| 1837 | Martin van Buren |
| 1841 | William H. Harrison |
| 1841 | John Tyler |
| 1845 | James K. Polk |
| 1849 | Zachary Taylor |
| 1850 | Milliard Fillmore |
| 1853 | Franklin Pierce |
| 1857 | James Buchanam |
| 1861 | Abraham Lincoln |
| 1865 | Andrew Johnson |
| 1869 | Ulysses S. Grant |
| 1877 | R. B. Hayes |
| 1881 | James Garfield |
| 1881 | Chester A. Artur |
| 1885 | Grover Cleveland |
| 1889 | Benjamin Harrison |
| 1893 | Grover Cleveland (2ª vez) |
| 1897 | William MacKinley |
| 1901 | Theodore Roosevelt |
| 1909 | William H. Taft |
| 1913 | Woodrow Wilson |
| 1921 | Warren G. Harding |
| 1923 | Calvin Coolidge |
| 1929 | Herbert C. Hoover |
| 1933 | Franklin D. Roosevelt |
| 1945 | Harry S. Truman |
| 1953 | Dwight Eisenhower |
| 1961 | John F. Kennedy |
| 1963 | Lyndon B. Johnson |
| 1969 | Richard M. Nixon |
| 1974 | Gerald R. Ford |
| 1977 | James Carter |
| 1981 | Ronald Reagan |
| 1989 | George Bush |
| 1993 | William Clinton |
Fuentes: ''Almanaque mundial'', varios años, Ed. América, Madrid.