It doesn’t feel as though the road out of Brownsville, Texas, will take you anywhere special. As you leave one of America’s poorest cities, drive-throughs and sprawl give way to run-down ranch homes and scrubland. Eventually, the landscape empties—flat, green, unremarkable. Maybe the only notable thing about the drive east on State Highway 4 is the border-patrol checkpoint, a reminder that the two-lane road runs parallel to the U.S.–Mexico border. But then a collection of boxes and cylinders appears on the horizon.
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