Era
20th century --
20th century
23
1945-1989
4
19th century --
4
21th century --
4
1993-2001
3
21st century --
3
History --
3
1917-1963
2
1946-
2
1989-
2
1848-1933
1
1862-1937
1
1863-1947
1
1874-1926
1
1884-1972
1
1885-1977
1
1892-1950
1
1892-1970
1
1901-1985
1
1903-1956
1
1910-1947
1
1911-1999
1
1914-1952
1
1918 - 1945
1
1918-1932
1
1919-1933
1
1919-2010
1
1922-
1
1925-1968
1
1926
1
1929 -
1
1929 --
1
1929-1968
1
1939-1945
1
1944-
1
1945
1
1945-1953
1
1948-1996
1
1964-
1
1971-1981
1
1981-2001
1
1989
1
1993-
1
20st century --
1
20the century
1
9th amendment
1