What term was used to describe the rough divine between free and slave states by the mid 1800s? a) the lincoln-douglas line b) the cotton curtain c) the slavery line d) the mason-dixon line

correct answer is D .The Mason-Dixon Line

answer; i believe the above statement is (true);

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.