There are a few other interesting and surprising things it can tell us, too:
The traffic between Mexico and the US is two-way
The United States is, unsurprisingly, the most frequent destination for Mexican migrants, but the reverse is also true — Mexico is the most popular choice for people leaving the US.
A large share of migrants leaving the US for Mexico will likely be either Mexican nationals or people of Mexican heritage. Mexicans currently account for nearly a third of the foreign-born citizens residing in the US, but in the 2000s the huge wave of migration that brought millions across the border during the 20th century began to reverse.
A big factor in this was the economic recession in the United States. This brought a sharp drop in demand for low-skilled labor, especially in construction — a key source of work for unauthorized Mexican migrants — as the housing market crashed. Hundreds of thousands of Mexicans are also deported from the US every year.
Many migrants have also headed back to Mexico for personal reasons: a survey by the nonprofit Mexicans and Americans Thinking Together found family reasons and nostalgia were cited as top reasons for the return trip.
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