Two days after hitler s invasion of britain and france declared war on germany.
a. poland
b. slovakia
c. france
d. austria

The answer is letter A. In 1939, After Hitler invaded Poland, Germany and France had declared war against Germany. During this war, Britain had suffered a great damage after Germany had made Athenia, a British ocean liner   sunk by one of its German submarines. The US remained neutral despite that death of 28 American who boarded in Athenia

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.