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- History27
- Boundaries8
- Emigration and immigration7
- Politics and government6
- Relations6
- Government policy5
- Mexican Americans5
- Cartography4
- Immigration enforcement4
- International Boundary Commission, United States and Mexico4
- Noncitizens4
- Surveying4
- Díaz, Porfirio, 1830-19153
- Garza, Catarino, 1859-18953
- Historiography3
- Journalists3
- Nationalism3
- Revolutionaries3
- Revolutions3
- Undocumented immigrants3