I would first go with A. Then move to C if not correct.
Answer:
Until Spanish-American war that was fought in 1898.
Explanation:
After Civil War United States started rearranging their internal, but also external policy. At the end of 19th Century United States started spreading their power outside their country. During that period in 1898 a war was waged against Spain. Known as the Spanish-American war it was fought around Cuba and Philippines. United States remained a world power.
1. New York
2. New Orleans
3. Boston
