Kỷ nguyên
20th century
21
19th century
6
1945-
4
1946-
4
Civil War, 1861-1865
4
Colonial period, ca. 1600-1775
4
Revolution, 1775-1783
4
1783-1789
3
1865-
3
1980-
3
1989-
3
2001-
3
1732-1799
2
1775-1783
2
1783-1809
2
1818-1895
2
1822-1885
2
1945-1989
2
1971-1981
2
1981-
2
1981-1993
2
To 1848
2
1743-1826
1
1809-1865
1
1820-1891
1
1838-1914
1
1849-1861
1
1857-1861
1
1861-1865
1
1863-1877
1
1874-1956
1
1895-1948
1
1912-
1
1914-
1
1916-
1
1918-
1
1919-1974
1
1924-
1
1925-1968
1
1935-
1
1937-
1
1942-
1
1950-
1
1953-
1
1981-1989
1
1989-1993
1
1993-2001
1
2000
1
2001-2009
1
21st century
1
hơn ...