MINNEAPOLIS - George Floyd’s memorial service here Thursday brought calls for sweeping change in America, as the Rev. Al Sharpton called Floyd’s death emblematic of oppression black people have faced since the nation’s founding and announced a new March on Washington reminiscent of the Rev. Martin Luther King Jr.’s historic action.Floyd’s May 25 death in police custody - after a white officer knelt on his neck for nearly nine minutes - has sent people spilling into the streets to protest police violence as part of a public uprising unlike any the country has seen in decades.