Presidential candidate Donald Trump's proposal to deport all 11 million immigrants living in the country illegally, along with their U.S.-born children, sounds far-fetched. But something similar happened before.
During the 1930s and into the 1940s, up to 2 million Mexicans and Mexican-Americans were deported or expelled from cities and towns across the U.S. and shipped to Mexico. According to some estimates, more than half of these people were U.S. citizens, born in the United States.