Era
20th century
340
19th century
209
1900-1999
133
To 1500
113
21st century
93
2000-2099
40
1800-1899
39
17th century
37
1945-
28
18th century
26
1800-1999
21
1980-
19
1865-1918
18
Medieval, 500-1500
15
16th century
14
1900-2099
12
Colonial period, ca. 1600-1775
12
1882-1941
11
1960-1980
11
Primitive and early church, ca. 30-600
11
1066-1485
10
To 476
10
1898-1951
9
Civil War, 1861-1865
8
Empire, 30 B.C.-284 A.D.
8
To 1775
8
1268-1559
7
1700-1799
7
1812-1870
7
1925-1953
7
2000-
7
30-600
7
476-1268
7
1918-1945
6
To 634
6
1600-1699
5
1775-1865
5
1789-1900
5
1865-1898
5
1876-1941
5
1947-
5
1971-
5
500-1500
5
Early modern and Elizabethan, 1500-1600
5
Republic, 265-30 B.C.
5
Roman period, 55 B.C.-449 A.D.
5
Since 1900
5
To 146 B.C.
5
1800-1950
4
1867-1931
4
more ...