Era
20th century
197
19th century
94
18th century
77
1945-
74
476-1492
60
1918-1945
58
21st century
56
1989-
52
To 1500
47
17th century
46
1789-1900
41
1789-1815
34
16th century
31
1871-1918
29
1492-1648
20
1648-1789
19
Middle Ages, 600-1500
15
1517-1648
14
1933-1945
13
Medieval, 500-1500
13
392-814
12
600-1500
12
1815-1848
11
Middle Ages, 500-1500
10
1648-1715
9
1815-1871
8
1769-1821
7
Revolution, 1789-1799
7
To 1492
7
To 476
7
World War, 1939-1945
7
15th century
6
1991-
6
Empire, 284-476
6
1848-1871
5
1917-1945
5
Colonial period, ca. 1600-1775
5
Consulate and First Empire, 1799-1815
5
1492-
4
1848-1849
4
1945-1953
4
1945-1989
4
1945-1991
4
Germanic Invasions, 3rd-6th centuries
4
Ottoman Empire, 1288-1918
4
13th-15th centuries
3
1492-1517
3
1600-1750
3
1775-1783
3
1878-1953
3
more ...