Answer:
D
Explanation:
The War Production Board was established in 1942 by the executive order of Franklin D. Roosevelt to regulate the production and allocation of materials and fuel during World War II in the United States.
It was mainly developments in the "steel" industry that made important contributions to improvements in the transportation system in the United States during this time, since the major advancement in transportation was in the railroads, which were made from steel.
Steam Engine,eletricity and assembly line.
Dogs played important roles in the Atlantic slave Trade because they helped capture slaves in Africa and were used to run slaves down similarly to how dogs are still being used today in the mountains to hunt down and keep sheep at bay. This is the similarity between the two.
Because the only way (back then) to process and make sugar farms was through manual labor. Since the Americans didn't want to put effort onto their own sugar farms, Africans were forced to do the labor part for them.
