Era
20th century
9
1900-1999
4
19th century
3
20e siècle
2
1732-1799
1
1792-1865
1
1819
1
1826-1882
1
1865-1934
1
1873-1947
1
1896-
1
1913-1921
1
1946-
1
Civil War, 1861-1865
1
Colonial period, ca. 1600-1775
1
Fire, 1845
1
French and Indian War, 1754-1763
1
Geschichte 1750-1940
1
Pittsburgh
1
Revolution, 1775-1783
1