Region
United States
319
Colorado
7
Outer space
6
Developing countries
4
India
3
Africa, Sub-Saharan
2
Latin America
2
New Jersey
2
New Mexico
2
Northeastern States
2
Sweden
2
Washington (D.C.)
2
West (U.S.)
2
Afghanistan
1
Africa South of the Sahara
1
Asia
1
Canada
1
Caribbean Area
1
China
1
Federal Triangle (Washington, D.C.)
1
Florida
1
Gettysburg National Military Park
1
Gettysburg National Military Park (Pa.)
1
Gulf States
1
Indiana
1
Italy
1
Japan
1
Mars (Planet)
1
Moon
1
New York (State)
1
Nigeria
1
Northwest, Pacific
1
Pennsylvania
1
Philippines
1
Portugal
1
Puerto Rico
1
Russia (Federation)
1
Texas
1