A number of hypotheses derived from sociological theory and from previous research concerning the potential collaboration of citizens of the United States and Mexico were tested. Included in the samples were 1,528 interviews from the United States general public; 306 interviews from rural persons residing in places of 2,500 or less in Michigan; 105 interviews with Spanish-speaking informants in the states of Arizona, California, Colorado, New Mexico, and Texas; 1,126 interviews with informants in urban Mexico; and 288 from rural Mexico, or from villages and towns of between 100 and 2,500 population. The findings are discussed under the following chapter titles: "Factors of Knowledge and Mass Communication,""Actual Behavioral Linkages,""Attitudes Toward the Across the Border Country and Toward Linkages with That Country,""Desire for Linkage and Collaboration: Its Predictability and Explanation," and "The Meaning of the Linkage-Contrasts of Mexico and the United States." It was concluded that in all samples, informants with more formal education had higher mean scores measuring their contacts in across the border and Anglo-Latino relations than did those with low educational attainment. It was also found that higher educational attainment was less frequently concomitant with high interaction between Anglos and Latinos in interaction arenas, such as church, formal groups, neighborhoods, and work places, than it was for other forms of interaction. (HBC)