Work crews ignite dynamite blasts in the remote and rugged southeast corner of Arizona, forever reshaping the landscape as they pulverize mountaintops in a rush to build more of President Donald Trump’s border wall before his term ends next month.

Each blast in Guadalupe Canyon releases puffs of dust as workers level land to make way for 30-foot-tall (9-meter-tall) steel columns near the New Mexico line. Heavy machines crawl over roads gouged into rocky slopes while one tap-tap-taps open holes for posts on U.S. Bureau of Land Management property.

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