Era
20th century
23
1900-1999
13
War with Mexico, 1845-1848
12
20e siècle
11
1784-1850
9
War of 1812
9
1846-1848
8
Civil War, 1861-1865
7
1845-1849
6
19th century
6
Revolution, 1775-1783
4
1800-1899
3
1821-1861
3
1945-1989
3
Mexican War, 1846-1848
3
1474-1548
2
1775-1865
2
1782-1850
2
1791-1880
2
1798-1858
2
1800-1874
2
1801-1881
2
1804-1869
2
1809-1865
2
1810-1883
2
1815-1872
2
1822-1885
2
1846 - 1848
2
1848
2
1849
2
1910-1971
2
1927-1993
2
1945-
2
1989-1993
2
Revolution, 1910-1920
2
To 1848
2
-1885
1
-approximately 1862
1
1700-1799
1
1750-1830
1
1758-1831
1
1760-1844
1
1764-1836
1
1767-1836
1
1767-1845
1
1772-1834
1
1772-1860
1
1773-1838
1
1776-1849
1
1777-1852
1
more ...