Which was probably not a cause of the Spanish-American War?
President McKinley’s enthusiasm for going to war
the publication of the stolen letter written by the Spanish ambassador criticizing President McKinley
the sinking of the USS Maine in the Havana harbor
a Cuban revolutionary movement against Spanish rule
Generally speaking, "President McKinley’s enthusiasm for going to war" was not a cause of the Spanish-American War, since he was not a necessarily war-hungry president.