PHOENIX (AP) — President Joe Biden is using his long-promised first presidential visit to Indian Country to formally apologize to Native Americans on Friday for a government-run boarding school system that for decades forcibly separated Indian children from their parents. Democrats hope Biden’s visit to the Gila River Indian Community’s land on the outskirts of metro Phoenix in Arizona will also provide a boost to Vice President Kamala Harris’ turnout effort in a key battleground state. Biden, whose presidency is winding down, had promised tribal leaders nearly two years ago that he would make a visit to Indian Country. The president, in an exchange with reporters Thursday before departing for Arizona, said an apology for the U.S. government’s role in the abuse and neglect of Native children was “something that…