Era
20th century
27
19th century
13
21st century
8
1945-
4
1783-1865
2
18th century
2
1945-1989
2
1400-1600
1
1724-1804
1
1770-1831
1
1783-1850
1
1785-1859
1
1789-1945
1
1803-1882
1
1804-1864
1
1819-1880
1
1821-1900
1
1861-1865 (Guerre de Sécession)
1
1865-1921
1
1899-1961
1
1936-1945
1
1950-
1
1960-
1
1971-1990
1
1989-
1
1990-
1
500-1400
1
Civil War, 1861-1865
1
Colonial period, ca. 1600-1775
1
Early church, ca. 30-600
1
Middle Ages, 600-1500
1
Modern period, 1750-
1
Qing dynasty, 1644-1912
1
Quatenary
1
Revolutionary period, 1775-1783
1