American Border Region -- 1 Boundaries -- 1 Case Studies 1 Case studies 1 Congress 1 Congress -- 1 Economic conditions -- 1 more ... El Chamizal (Mexico and Tex.) 1 Environmental conditions -- 1 Foreign economic relations -- 1 Foreign relations -- 1 Industries -- 1 Industry and State -- 1 Industry and state -- 1 Mexican -- 1 Relations -- 1 less ...