What steps did the supporters of united states isolationism take to ensure that the country remained neutral in an international conflict?

Isolationism in America was based on two beliefs. The first was the view that the United States should avoid any political commitment that tied American policy and action to the policies and actions of other nations. The second was a pervasive belief that the central aim of American foreign policy was to avoid foreign wars at all costs. 

C.before he invaded rome