Which incident caused the united states to declare war on spain in 1898?

The USS Maine that was blow up in Havana Harbor.

Explanation:

“the battle of stalingrad is not a turning point necessarily in strategic terms, because a lot more has to be done before the soviets can be certain of defeating germany,” says renowned world war ii historian richard overy. the germans had fought nearly a thousand miles across the soviet union to get to stalingrad.

it would be a. that is the only one i could think of