Which of the following actions was the immediate cause of the Civil War?

battle of saint-mihiel, (12–16 september 1918), allied victory and the first u.s.-led offensive in world war i. the allied attack against the saint-mihiel salient provided the americans with an opportunity to use their forces on the western front en masse.

explanation:

legal rights and freedom of speech.i hope that it is correct.

brainliest if correct