Lets do some elimination. :)
It wont be a because of the fact the war had just ended, the veterans were traumatized and both physically and mentally unstable. Not C, the civil rights movement was begging around this time period so they had a long journey. That leaves you with B and D. The economy was not the best in the 1950's so people looking for jobs didn't really make the cut.
Hope I was able to help. :D
Answer:
A. The Founding Fathers realized establishing a federal government would help protect America.
Explanation:
The policy of mercantilism was to manipulate a government in a country and its economy to create a favorable trade balance. Mercantilism supported the belief in the bendiest of profitable trading also known as commercialism.