Era
20th century
10
1895-1948
3
1945-1989
3
1980-2020
3
Civil War, 1861-1865
3
1783-1809
2
1783-1815
2
1918-1988
2
1918-2002
2
1971-
2
1989-
2
19th century
2
21st century
2
1829-1887
1
1835-1910
1
1848-
1
1860-1890
1
1878-1923
1
1882-1956
1
1914-2000
1
1918-1986
1
1920-2013
1
1931-1995
1
1932-2009
1
1935-2020
1
1936-2018
1
1946-
1
1948-
1
1950-
1
1954-
1
1956 November 6-2017 May 27
1
1958-
1
1969-1974
1
1975-
1
1983 November 26-
1
1983-
1
1993-2001
1
2008
1
2009-
1
2009-2017
1
2016
1
Revolution, 1775-1783
1