Describe two reasons why America experienced an economic boom during the 1920s

The causes of the Economic Boom of the 1920s were the Republican government's policies of Isolationism and Protectionism, the Mellon Plan, the Assembly line and the mass production of consumer goods such as the Ford Model T Automobile and luxury labor saving devices and access to easy credit on installment plans / The main reasons for America's economic boom in the 1920s were technological progress which led to the mass production of goods, the electrification of America,