Which incident caused the United States to declare war on Spain in 1898?

a.

the USS Maine was blown up in Havana Harbor

b.

a rebellion was occurring in the Spanish Philippines

c.

the Panama Canal was erected

d.

the Roosevelt Corollary to the Monroe Doctrine was signed

Correct answer is A.) The USS Maine was blown up in Havana Harbor

The Incident that caused the U. S to declare war on Spain in 1898 was the USS Maine that was blow up in Havana Harbor. The Battleship Maine was blown and started to sink. The result of the war was the signing of the Treaty of Paris on 10/12/1898 that made Spain to lose its control over the remaining parts of its oversea empire that included Puerto Rico, Guam, Philippines Islands, and Cuba.