Following the war of 1812, the construction of us railroads and growth of us cities showed that
a) the economy was growing quickly.
b) the united states had won the war.
c) great britain had lost the war.
d) the economy only grew in cities.

I would say the answer is A. D would be incorrect because constructing railroads is all over the country, not just in cities. B and C is wrong because you can't assume with the information given to you.

Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.

Why do you have to ask such hard questions.