Select all that apply Which factors have contributed to the increase in unauthorized immigrants? (Choose every correct answer.) Multiple select question. The bracero program of the 1940s recruited Mexicans as legal temporary workers, but many remained after the program ended. U.S. employers recruit immigrant laborers, including unauthorized immigrants. Federal regulations offer high wages and free health care to undocumented workers who seek work in the United States. NAFTA eliminated barriers to cross-border trade and resulted in displaced Mexican workers looking for opportunities in the United States