The american revolution widened the divide between free americans and those who remained in slavery.

Yes, that is "True".

Race, which was one of numerous sorts of lawful and social disparity in colonial America, developed as an advantageous justification for the presence of slavery in a land that guaranteed to be focused on freedom. "We the people" more implied just white Americans.

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;

in 1989, tiananmen square in beijing was the site of china’s main industries. china’s government headquarters. -pro-democracy demonstrations. (second choice)