Era
20th century
108
20th century --
86
19th century
44
21st century
25
19th century --
23
1942-1945
18
21st century --
17
1933-1945
15
1939-1945 --
14
1945-
13
To 332 B.C
12
17th century
11
18th century
10
18th century --
8
1939-1945
8
1946-
8
1861-1865
7
1889-1945
7
1948-1960
7
750-1258
7
To 146 B.C.
7
16th century
6
1926-
6
1949-1976
6
To 1500
6
1917-1948
5
1952-
5
1969-
5
2001-
5
Civil war, 2011-
5
Japanese occupation, 1942-1945
5
16th century --
4
1775-1783
4
1800-1963
4
1945
4
1947
4
1947-
4
1991-
4
2003-
4
332-30 B.C.
4
476-1492
4
Colonial period, ca. 1600-1775
4
Siege,1942
4
To 146 B.C
4
15th century
3
1789-1815
3
1809-1865
3
1917-1963
3
1918-1933
3
1921-
3
more ...