Why did so many americans quickly sign up for Spanish American War?

On April 21 , 1898 the united states declared war against spain

Explanation:

the reason for war were many , butsl there were two immediate ones:

1) Americans support by cuban and filipinos against spanish rule

2) The mysterious explosion of the battleship U.S.S. Maine in Havana Harbor.

president thomas jefferson hoped that the embargo act of 1807 would the united states by demonstrating to britain and france their dependence on american goods, convincing them to respect american neutrality and stop impressing american seamen. instead, the act had a devastating effect on american trade.

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.