Era
20th century
26
21st century
18
2000-2099
10
1900-1999
7
1985-1991
3
19th century
3
1800-1899
2
1918-1945
2
1919-1933
2
1924-2014
2
1929
2
1945-
2
1961-1969
2
1970-1991
2
1989-
2
Civil War, 1861-1865
2
1800-1999
1
1828-1905
1
1832-1899
1
1832-1914
1
1862-1930
1
1902-1994
1
1933-1945
1
1945-1989
1
1950-
1
1953-1985
1
1957-
1
1962-
1
1964-
1
1976-2000
1
1976-2002
1
1977-
1
1980-
1
1990
1
1990-
1
1991-
1
1993-
1
2013
1
2017-2021
1
2020-
1
20e siècle
1
21e siècle
1
Geschichte (1945-1960)
1
Geschichte (1950-1960)
1
Nicholas II, 1894-1917
1
Since 1945
1
Since 1989
1
Since 2017
1
Unification, 1990
1