ISBN-13: 9781503032996 / Angielski / Miękka / 2015 / 50 str.
The country's immigration and naturalization laws have been subjects of episodic controversy since America's founding, but illegal immigration only became an issue in the early 20th century, when Congress passed the first strict restrictions on legal admissions. Illegal immigration declined during the Great Depression and during and after World War II, when most labor migration occurred through the U.S.-Mexico Bracero program.Immigration control re-emerged as a national concern during the 1970s, when the end of the Bracero program, new restrictions on Western Hemisphere migration, and growing U.S. demand for foreign-born workers combined to cause a sharp increase in unauthorized migration flows.