How did the United States demonstrate its isolation policy before world war ll ?

The United States of America in the 1930s and before World War II followed an isolationist policy which demonstrated the avoiding of alliances and other international relationships. It rather focused on her own advancement and involvement in other's affairs only through peaceful negotiations.

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.

i believe the correct answer is b.