Contractors hired by Customs and Border Patrol began blasting ground last week in areas of Organ Pipe Cactus National Monument, the latest step in President Donald Trump’s $646 million plan to build a 30-foot wall along 63 miles of the Arizona-Mexico border. While the border wall construction has been controversial every step of the way, the construction in Organ Pipe Cactus is happening at Monument Hill, which contains burial grounds with cultural significance for the O’odham people, who have lived in the borderlands before it was divided between the United States and Mexico.

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