4. Line in the Sand

Anthony Suau for TIME
After years of discussion, construction of the $1.2 billion fence on the border of the U.S. and Mexico began in earnest. Engineers projected that 650 miiles of the wall, about one-third the length of the entire border, would be completed by the end of 2008. This section, watched over by agents of the U.S. Border Patrol stretches across the desert near San Luis, Arizona.

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