Era
1265-1321
1,272
19th century
1,046
18th century
638
20th century
535
1875-1926
400
1874-1963
329
17th century
322
Revolution, 1775-1783
276
1564-1616
264
Colonial period, ca. 1600-1775
251
16th century
168
1770-1850
160
1809-1865
154
1817
137
1856-1950
130
Civil War, 1861-1865
121
1900-1999
114
1819-1892
100
1775-1783
93
1800-1899
90
Cretaceous
86
Tertiary
82
Louis XIV, 1643-1715
80
1769-1821
74
1900-1910
72
1732-1799
71
1807
71
Colonial period
71
1600 - 1775
69
1931-1940
69
1770-1780
65
To 1775
65
Early works to 1800
62
1706-1790
61
Pleistocene
60
Revolution, 1789-1799
60
1608-1674
59
1789-1797
59
1809
58
1808
57
1890-1980
57
Revolution
57
Miocene
56
1782-1852
54
1921-1930
54
Eocene
54
French and Indian War, 1754-1763
53
15th century
52
1811
52
1838-1905
52
more ...