Era
20th century
174
Civil War, 1861-1865
126
1939-1945
70
19th century
57
1900-1999
50
1861-1865
33
Revolution, 1775-1783
29
1800-1899
27
1929
25
1945-1970
21
1947-
21
1961-1975
20
21st century
20
1564-1616
16
Siglo XX
16
1809-1865
15
18th century
15
2233-2371
15
1900 - 1999
14
1933-1945
14
1939 - 1945
14
1948-
14
1954-
14
1953-
13
1905-1976
12
1933-
12
2000-2099
12
Colonial period, ca. 1600-1775
12
1923-1955
11
1943-
11
1945-1989
11
1945-1991
11
2305-2399
11
Guerra de Secesión, 1861-1865
11
1847-1882
10
1888-1959
10
1903-1934
10
1917-1963
10
1957-
10
2003-2011
10
1800 - 1899
9
1902-1968
9
1946-
9
1952-
9
1961 - 1975
9
1971-
9
1991
9
1837-1863
8
1885-1945
8
1915-1985
8
more ...