In this 1942 photo provided by the U.S. Army Corps of Engineers Office of History, soldiers try to free a bulldozer stuck in mud during construction of the Alaska Highway, in the Northern Sector of Alaska. Nearly 4,000 segregated black soldiers helped build the highway across Alaska and Canada during World War II, a contribution largely ignored for decades but drawing attention as the 75th anniversary approaches. (U.S. Army Corps of Engineers Office of History via AP)
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