Final answer:
The United States declared war against Spain.
Step-by-step explanation:
The subject of this question is History.
Possible trade disruptions, financial investments, and alleged inhumane treatment against Cubans led the United States to declare war against Spain.
One example of alleged inhumane treatment was the sinking of the USS Maine in Havana Harbor on February 15, 1898, which led to the outbreak of the Spanish-American War.
Learn more about Causes of the Spanish-American War