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A thousand little maps: Kindness on the border

As you head south out of San Antonio, you begin to enter the brush country. It’s something of a cross between a desert and a briar patch. Cacti abound, and almost every plant has thorns or spines of some kind. Everything is armored and protected. Even the cacti are on the offensive. It is this brutal and scorched countryside that thousands of Mexicans brave each year as they cross the border looking for a share of the legendary wealth of los Estados Unidos.