ISTANBUL At least 3,104 Native American children died in boarding schools in the US between 1828 and 1970 -- a figure three times higher than the government's estimate, The Washington Post reported Sunday. The Post described the deaths in the schools, which were established to forcibly assimilate Indigenous children into European settler culture, as "a dark chapter in American history that has long been ignored and largely covered up." "The boarding schools were not schools but prison camps,