Which event would have first caused the us to begin reversing its neutrality acts in the early stages of world war 2?

Germany's invasion of Poland ~

This could be a tricky question. Germany's Save invasion of Poland is the right answer because it happened before any of the other issues here. True, the United States began the process of revising the Neutrality Acts before that, but the question is not asking that. The invasion of Poland on September 1, 1939, caused President Roosevelt to ask Congress to change the neutrality acts to prevent giving "passive aid" to the enemies.