Article Two, Section One of the United States Constitution
The main reason was the South wanted to preserve slavery. The North wanted to abolish it. If you want some other reasons than slavery, let me know, and I will do my best to add more to this answer.
The Treaty of Paris, ending the Spanish-American War, was signed on December 10. Spain gave up Guam, Puerto Rico, its possessions in the West Indies, and the Philippines in exchange for a U.S. payment of $20 million. The United States occupied Cuba but, as provided for in the Teller Amendment, did not try to annex it.
Answer:
The correct answer is "Accusations of bribery against the Grant Administration."
Explanation: