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Subject
- History60
- Emigration and immigration50
- Social conditions45
- Border security28
- Mexican Americans26
- Noncitizens25
- Government policy21
- Mexicans19
- Social aspects18
- Border patrols17
- Economic conditions17
- Indians of North America17
- Drug traffic16
- Economic history16
- Immigrants16
- Boundaries13
- Environmental conditions13
- Free trade13
- Ecology11
- History and criticism11