B. and D.
Immigrants were mainly used to work in factories in terrible conditions for low-wages because they had no skill and since they had no language skills this is all that they could do - manual labor
And since they were running from their countries due to poverty, most of them could not afford best travelling conditions since they did not have enough money. Not to mention that many of them were illegaly travelling, hidden in the lower parts of the ship.
The boll weevil beacuse it wiped out crops all cross the South
The reconstruction of Germany after World War II was a long process. Germany had suffered heavy losses during the war, both in lives and industrial power. ... At the Potsdam Conference, the victorious Allies ceded roughly 25 percent of Germany's pre-Anschluss territory to Poland and the Soviet Union.