We tend to think that the United States–Mexico border is a one-way street, with the majority of migrants streaming across from Mexico to the US. According to recent data from the Mexican National Survey of Demographic Dynamics, however, it’s actually the other way around.
Between 2009 and 2014, one million Mexicans left the US for Mexico, and census data shows that during the same period, just 870,000 Mexicans migrated to the US. Mexico’s statistics institute has also estimated that there are at least 799,000 US-born people living in Mexico, four times as many as in 1990.
