Era
1918-1945
137
20th century
101
1945-
94
1871-1918
65
1789-1900
43
19th century
32
1989-
31
18th century
27
1789-1815
18
1933-1945
17
1815-1848
16
1815-1871
15
1492-1648
14
21st century
12
1648-1789
11
1848-1871
11
476-1492
10
17th century
8
1837-1901
7
1870-1940
7
16th century
6
1773-1859
6
1936-1945
6
1517-1648
5
1815-1898
5
1889-1945
5
1914-1940
5
1945-1953
5
1990-
5
To 1500
5
1648-1715
4
1769-1821
4
1815-1870
4
1945-1989
4
1945-1990
4
Victoria, 1837-1901
4
1769-1822
3
1775-1783
3
1878-1953
3
1900-1999
3
1918-1933
3
1938-1945
3
1945-1955
3
Civil War, 1936-1939
3
Revolution, 1789-1799
3
1558-1603
2
1603-1714
2
1770-1861
2
1784-1865
2
1800-1837
2
more ...