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Subject (Region)
- United States775
- Mexican-American Border Region222
- Mexico155
- Canada84
- European Union countries64
- Europe57
- North America34
- Northern boundary of the United States23
- Central America22
- Arizona19
- Poland16
- Texas16
- China15
- Great Britain13
- San Diego (Calif.)12
- United States12
- Western Hemisphere12
- Indonesia11
- Africa9
- Czech Republic9