Era
20th century
46
1939-1945
43
1908-1964
31
19th century
29
1564-1616
26
1831-1915
17
1900-1999
17
1804-1868
16
18th century
12
1929
12
1847-1882
11
Civil War, 1861-1865
11
1800-1899
10
1889-1945
10
1908-1969
10
1885-1945
9
1939 - 1945
9
1940-
9
Colonial period, ca. 1600-1775
9
Revolution, 1910-1920
9
1848-1929
8
1912-1994
8
1914-1918
8
1926-2005
8
1927-1987
8
1800 - 1899
7
1888-1954
7
1925-2008
7
1933-
7
1972-1993
7
21st century
7
Siglo XX
7
1475-1564
6
1844-1915
6
1868-1924
6
1878-1972
6
1897-1937
6
1900 - 1999
6
1902-1968
6
1914-1958
6
1971-
6
2001-2010
6
-30 B.C
5
12-41
5
1809-1865
5
1830-1915
5
1878-1952
5
1879-1919
5
1879-1952
5
1888-1931
5
more ...