Era
1914-1918
7
1945-
7
1914 - 1918
4
1944-
4
1775-1865
3
1991-
3
1917
2
1939 - 1945
2
1952-
2
1981-
2
1981-2001
2
1987
2
2009-
2
21st century
2
Civil War, 1861-1865
2
1760-1844
1
1797-1840
1
1817-1825
1
1877-1954
1
1903-1992
1
1905
1
1907
1
1908
1
1909
1
1910
1
1911
1
1912
1
1914
1
1915
1
1916
1
1918
1
1918-
1
1918-1945
1
1939-1945
1
1960-
1
1986
1
1991
1
Since 1951
1
Since 1991
1
Since 2009
1