Introduced to Senator Johnson in 1959; Chamizal area problem; resolved in 1963; El Paso-Juarez cities bridge; improved relations with Mexico during LBJ's presidency; Mexico's policy in Cuba; U.S. intervention in Santo Domingo; Economic Commission for Latin America; Third Inter-American Special Conference in Rio de Janeiro in 1967; American foreign investment in Mexico; Inter-American Bank of Development; LBJ's visit to Mexico City in April 1966; Colorado River salinity problem; communism in Mexico