It is C, I think. Not 100% sure
Answer: I gotchu
Explanation: 1. The North had Britain and the French on there side
2. The North had an enormous industrial advantage
3. Nearly 21 million people lived in 23 Northern states. The South claimed just 9 million people — including 3.5 million slaves
4. Since the North controlled the navy, the seas were in the hands of the Union.
5. The North had twice the density of railroads per square mile
6. The North had loads more factories to make supplies for the Union army
7. The North had many non slave people to grow food and work in factories
8. This one is kinda obvious but the North won the war.
I believe they became important members in the Cold War.
The dispersal of new food crops from the Americas was absolutely a critical reason for the development of populace. The Columbian Exchange brought about the movement of millions of individuals.