Which was a factor in the development of a two-party system in elections

Got this question wrong twice. The correct answer they game me is, Southern concern over potential abolition of slavery by the dominant political party

evaluate the extent to which the seven years' war (french and indian war, 1754–1763) marked a turning point in american relations with great britain, analyzing what changed and what stayed the same from the period before the war to the period after it.

the british they shot them