Era
20th century
12
1865-1950
7
1951-
6
19th century
6
Civil War, 1861-1865
4
1800-1899
3
1933-1945
3
1945-1989
3
1948
3
1775-1865
2
1847-1918
2
1900-1999
2
1863-1877
1
1865-1945
1
1877-1964
1
1903-1986
1
1922-2010
1
1928-2005
1
1929-1968
1
21st century
1
Geschichte 1775-1865
1
Geschichte 1900-2000
1
Since 1865
1
To 1964
1