Interventionist believed that providing aid to Britain would have what effect?
Interventionists believed that providing aid to Britain would keep the U.S. out of war. World War II lasted from 1939 to 1945.
In his eyes, Britain was treating the US poorly. He also believed that everyone knew how they were being treated, and could see the effect on the general public. Therefore to him it was common sense to break away, seeing as Britain's goal was to protect and help the US, and they were doing a terrible job.