Answer:
Vikings are Scandinavian seafaring traders, warriors and pirates who raided and colonized wide areas of Europe from the late 8th to the 11th century. Mongols were a tribe that ruled the largest contiguous empire in world history and for some time was the most feared empire in Eurasia.
Explanation:
One feature that helped the U.S. grow in industry was the inovation.
Taking into account the statement above: "What was one of the advantages of the huge estates, or villas, created in the fourth century?a. They offered protection in an unsettled world.
b. They provided the basis for agriculture, trade, and industry.
c. They facilitated a process of cultural exchange.
d. They were a way peasants could avoid paying taxes."
The answer is: A.
Hope this helps.