Era
20th century
595
19th century
243
21st century
56
18th century
31
Civil War, 1861-1865
19
1819-1891
18
1946-
18
Colonial period, ca. 1600-1775
14
1843-1916
13
1783-1865
11
1899-1961
11
1993-2001
11
1564-1616
10
1783-1850
10
1945-1989
10
Revolution, 1775-1783
10
1803-1882
9
1804-1864
9
1819-1892
9
1830-1886
9
1835-1910
9
1989-
9
17th century
8
Revolutionary period, 1775-1783
8
1862-1937
7
1867-1957
7
1873-1947
7
1945-
7
1888-1953
6
1915-1985
6
1915-2005
6
2017-2021
6
1811-1896
5
1817-1862
5
1837-1920
5
1885-1972
5
1897-1962
5
1970-
5
1980-2020
5
1771-1810
4
1789-1851
4
1874-1946
4
1878-1967
4
1882-1941
4
1896-1940
4
1907-2003
4
1922-2000
4
1943-
4
1944-
4
1957-
4
more ...