Great national concern has been continuously evidenced for some years now over the flow and counterflow of persons of Mexican origin across the political border between the United States and Mexico. Congressional committees, a President's Commission, labor, farm and other groups have been quite vocal in suggesting ways of dealing with the problems created by migrant labor of Mexican origin. Much of the more recent discussion, however, has centered upon the Mexican in agriculture, and more particularly on those who intend, or whom it is intended, to be purely transitory in this country. Crucial as the problems created by migrant Mexican agricultural labor are, however, for Mexicans, United States workers, and many United States farmers and communities, the whole of the problem created by mobility across an international border into many types of enterprise of peoples representing different cultures, standards of living, skills and traditions is much broader. It is the purpose of this paper to present the results of certain exploratory research on another aspect of this general problem. From the days of Mexican sovereignty over much of the Southwest, migration into what is now the United States, and even into what was then United States, has occurred. Much of this traffic has been one way. Many Mexicans have come to the United States to stay, whether or not that was the original intent. Because of the ease created by proximity, the length and difficulty of guarding the border, and the oft forgotten fact that legal migration is, relative to European or Asiatic immigration, at law easy (there being no quota limitation) the volume of Mexican migrants coming to remain has been large. Because of its proximity, the numbers coming to remain in Texas have been exceptionally large. It has