Unforgiving terrain

In the rugged places where the man-made border and its fencing between countries disappear, the earth takes over, in its imposing and intimidating way. For most of the border’s 2,000 miles, there are few roads near it, save for some dirt paths carved by Border Patrol agents. Here and there, weathered stone obelisks stand watch, markers from surveying done in 1848, when California passed to the United States from Mexico via the Treaty of Guadalupe Hidalgo.

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