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First Sign of Chocolate in Ancient U.S. Found Chocolate made its U.S. debut about 1,000 years ago. Posted February 2, 2009 By Jeanna Bryner, LiveScience Chocolate residues left on ancient jars mark cacao's earliest known presence north of what is now the U.S.-Mexico border. The residues, found on pottery shards excavated from a large pueblo (called Pueblo Bonito) in Chaco Canyon in northwester…