More than any other city in Yuma County, the prosperity of San Luis, Ariz., depends on the steady flow of people, vehicles and merchandise across the U.S.-Mexican border, Mayor Gerardo Sanchez says.

Most of the customers of businesses in San Luis come from neighboring Mexico, and Sanchez said in 2016 alone, more than 8 million people passed through San Luis I port of entry on their way into the United States.

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