A powerful ruling class I took this already.
The Salem witch hunts and trials began by D. A group of girls accused people of bewitching them.
Answer:
Although there are no right answers I'd say the Louisiana Purchase because it gave a huge amount of land and helped with transporting goods across the country. Making it easier to get resources that would otherwise take a long time to transport.
Be sure to change words and parts of my answer otherwise its just plagiarism and you could get an F.
C.Northern capitalists and industrialists came to dominate on the national scene, taking power away from the former southern slaveholder.