This essay is based on a talk I delivered at Texas A&M University on December 10, 2005, in response to an earlier lecture at the university by Professor Samuel P. Huntington. It relies on social science evidence to first address Huntington's contention that Mexicans are overwhelming American borders. It then turns to evidence that Mexican Americans are in fact assimilating culturally but still have been less economically successful than the descendants of earlier European immigrants. The essay examines factors that have differentiated the Mexican American trajectory of incorporation and are likely to continue to do so. Finally, it calls for the American public and policy makers to make well-informed choices about what levels of immigration are desirable and who should be admitted, to improve immigrants' economic opportunities through education, and to embrace a multilingual and multi-ethnic future for the country. (Contains 4 figures and 1 note.)