Answer:
-Nazi aggression is endangering democracy all over the world
-Gaining more power if all of the democratic nations fail to subdue them
Step-by-step explanation:
He is stating that Germany seems to be winning the war, and if that they conquer Europe, Asia, and Africa as they´ve been doing the sum of the resources that they´d have at dissposal would be larger than the power that the american continent could gather, this means that democracy all over the world is at risk, and United States had to enter the war in order to balance it in favor of the free wolrd before Germany became too powerful to fight against.