Which event surrounding world war i had the greatest impact on americans?

At the beginning of the war, why was hitler allowed to continue his aggression without resistance from other european countries

1. what was the result of growing nationalism and pan-africanism on european-african relations? africans were encouraged to seek independence from europe. european colonialism grew and strengthened in africa. the change of power from european to african rule went smoothly. africans believed they could live peacefully with europeans.

Brainliestttme : describe the following event: increase in islamic extremism in the middle east