Wich event do you think was most responsible for the end of the middle ages and why

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:

there has only been 12 presidents. the 12th president is/was moon jae-in