Era
20th century
1,208
1914-1918
782
1900-1999
549
World War, 1914-1918
154
1913-1921
131
1918-1945
78
1871-1918
62
1856-1924
59
1914 - 1918
58
1914-1945
49
Revolution, 1917-1921
38
1910-1936
36
1918-1933
36
1888-1935
33
19th century
32
German occupation, 1914-1918
30
1911-1920
27
George V, 1910-1936
26
1914-1940
25
1933-1945
22
1900 - 1999
21
1888-1918
19
Nicholas II, 1894-1917
17
1865-1918
16
Ottoman Empire, 1288-1918
14
1800-1999
13
1874-1965
13
1894-1917
13
1863-1945
12
1867-1918
12
Civil War, 1861-1865
12
1882-1941
11
1914-1923
11
21st century
11
1860-1948
10
1899-1961
10
1910-1921
10
1911 - 1920
10
Mehmed V, 1909-1918
10
1801-1917
9
1917-1945
9
1918-1932
9
1919-1933
9
1921-1923
9
1862-1937
8
1886-1967
8
1901-1953
8
1859-1941
7
1873-1939
7
1893-1918
7
more ...