Eastern European Nations.
I do not know the answer, but if I were to guess, that it would be the one about plantations.
Plantations were hotspots of manual labor, specifically slaves. And when slaves were outlawed the plantation owners lose there main source of “profit” (aka the need to not pay workers for manual labor and instead use that money to get more laborers) it seems like the logical answer to me.
Also using process of elimination we know that the war could have spilt the country in two. So the union was indeed saved.
Because Columbus though that he had traveled across the sea and landed in India. He didn’t know the concept of America so he called them Indians
With the Arms and Space Races becoming increasingly important, Kennedy knew he needed to crush communism as well, to show the Soviets that it was unacceptable for their govt. to spread.