Subject Region
United States
191
India
75
Developing countries
56
China
43
Mexico
37
Great Britain
36
England
31
Europe
27
Southern States
25
Africa
24
Japan
19
Latin America
16
Africa, Sub-Saharan
15
Canada
15
Asia
13
France
13
Brazil
12
Soviet Union
11
Argentina
10
California
10
Ireland
10
Rome
10
Spain
10
Egypt
9
Middle West
9
Peru
9
Europe, Eastern
8
European Union countries
8
Australia
7
Colombia
7
Indonesia
7
Nicaragua
7
Russia (Federation)
7
America Latina
6
Confederate States of America
6
Georgia
6
Guatemala
6
Iowa
6
New York (State)
6
Russia
6
West (U.S.)
6
Chile
5
North America
5
Papua New Guinea
5
Punjab
5
Bangladesh
4
Communist countries
4
Ghana
4
Great Plains
4
Iran
4
more ...