How did the policy of appeasement influence the beginning of World War II?

Question

The policy emboldened Hitler to further acts of aggression.
The policy delayed the entry of the United States into the war.
The policy encouraged China to resist Japanese aggression.
The policy promoted Allied intervention to protect European Jews.

Answer 1

The policy emboldened Hitler to further acts of aggression.

Answer 2

Which specific event caused the United States to enter World War II?
the conquering of nations in Europe and Asia
the use of navy warfare against civilian ships
the attack of the navy base at Pearl Harbor
the rise of Hitler to power in Germany

Answer 3

the attack of the navy base at Pearl Harbor.