2/21/2017 New York Times
Just over 10 years ago, United States Border Patrol agents were startled by an unexpected new development in their rear-guard battle to stop illegal immigration: Brazilians.
In 2005 thousands of them started streaming across the southwestern border. More than 31,000 were apprehended by the Border Patrol trying to make their way into the United States, a number surpassed only by Mexicans, Salvadorans and Hondurans.
And then, just as abruptly, the flow stopped. Under pressure from Washington, Mexico reimposed a tourist visa requirement on Brazil that it had eliminated five years before. This severed a trafficking route that started with an easy flight from Rio de Janeiro to Cancún and ended in a trek across the desert into southern Texas.