What was a positive effect of the colombian exchange

What was the main argument of plessy in plessy v. ferguson

How did the catholic church change as a result of the council of trent? a. catholic printers were encouraged to publish translations of the bible in common languages b. members of the catholic clergy were required to avoid luxurious lifestyles c. catholics were told they could earn salvation through god’s grace alone d. european catholics were barred from initiating any conflict with protestants.

How did southern slaveholders attempt to convince people in the north to support slavery?