What feature of the United States helped industry grow quickly in the country after the Civil War?
A. American workers worked harder than European workers.
B. The United States had access to vast natural resources.
C. The United States had the world's best engineers.
D. American presidents were more business friendly than leaders of other nations.
It would be mainly that "B. The United States had access to vast natural resources" that helped industry grow quickly in the country after the Civil War, since many countries (especially in Europe) were confined to much smaller areas.
