Era
19th century
9
1800-1899
3
1946-
3
2017-2021
2
20th century
2
1706-1790
1
1786-1836
1
1821
1
1838-1894
1
1852
1
1857-1937
1
1861-1865
1
1865-1900
1
1875-1952
1
1884-1961
1
1891-1969
1
1892-1956
1
1897-1971
1
1897-1976
1
1898-
1
1899-1962
1
1899-1985
1
1903-1963
1
1945-1989
1
1965-1975
1
1969-1974
1
1974-1977
1
1989-
1
2009-2017
1
2016
1
21st century
1
Civil War, 1861-1865
1
Colonial period, ca. 1600-1775
1
Revolutionary period
1
Since 1945
1