B I think it is sorry if I’m wrong
The reason why immagrants didnt go to the south because of slavery.
Winston Churchill is best known as the greatest statesman of the 20th century.He was the prime minister of England. England was one of the United States's closest allies throughout the 20th century, and Churchill was a highly respected, successful leader, so Americans trusted his opinion of the Soviet Union when he spoke of the Iron Curtain in the 1940s.
I would think that they had begun to build up resistances to the virus's and conditions they were exposed to.