Era
1573?-1637
1
1881-1968
1
1900-1999
4
1939-1945
1
1953-1985
1
1953-1991
1
1961-1963
1
1977-1981
2
1977-1989
1
1981-
1
1981-1989
2
1981-2001
1
1985-1991
1
1985-1995
1
1989-
2
2001-2021
1
20th century
6
Civil War, 1861-1865
1
Holocene
1
Revolution, 1789-1799
1
Since 1900
1
Since 1981
1
Soviet occupation, 1979-1989
1