Answer:
Step-by-step explanation:
Before the war, the United States allowed almost any person from any country to enter the United States. There were quotas because America did not want to be overrun by Europe's problems. She wanted to remain neutral for as long as possible. I don't know the formula for determining a quota, but there certainly was one.
So the answer to your question is the appearance of neutrality.
Behind the scenes there was a lot of discussion about when and why America was to enter the war.
Pearl Harbor, grim as it was, solved their problem.