Answer:
By signing an agreement to loan to Germany to repay for the first world war costs, Britain and France had to expect less and the discussion of disarmament.
Step-by-step explanation:
American foreign policy was following the policy of "isolation" during 1920 but it is impossible for America to completely make itself withdraw from world affairs.
Because after the "first world war" United stated turned into a leading loan creditor state and helping those countries by lending loans who are destroyed due to the First World War.
There were two factors of promoting Disarmament during 1920, Many Americans believed that disarmament helps the world to prevent another world war, and the second Anglo-German naval rivalry is the reason for the First World War.