Historical Period
20th century
82
19th century
75
18th century
30
21st century
18
Civil War, 1861-1865
16
Colonial period, ca. 1600-1775
12
To 1865
12
17th century
11
1975-
7
1989-
7
1945-
6
To 1500
6
1865-1918
5
1960-1980
5
To 500
5
16th century
4
1918-1932
4
1933-1945
4
1980-2020
4
1991-
4
Modern period, 1600-
4
1644-1912
3
1789-1900
3
1874-1941
3
1925-2003
3
1932-2010
3
1949-
3
1971-1979
3
1977-1981
3
1981-
3
1990-
3
1993-
3
2000-
3
960-1644
3
Augustus, 30 B.C.-14 A.D.
3
Japanese occupation, 1910-1945
3
To 1964
3
-632
2
1600-1868
2
1714-1837
2
1775-1865
2
1865-
2
1868-1963
2
1870-1940
2
1900-1999
2
1913-1994
2
1924-
2
1925-1961
2
1945-1990
2
1945-1995
2
more ...