Answer: Roosevelt promoted U.S. intervention in the European conflict, which went against mainstream support of U.S. isolationism.
Step-by-step explanation:
The Quarantine Speech, given by U.S. President Franklin D. Roosevelt on October 5, 1937, in Chicago, called for a worldwide quarantine as a better option to the political spirit of American neutrality and non-intervention that was widespread at the moment. The last few years, against Roosevelt´s wishes, Congress had passed the Neutrality Acts. His speech increased America's isolationist stance.