Stop ignoring myi dont understand ! what 3 factors played a role in economic prosperity experienced in america, following world war one?

Before WWI America owed Europe a lot of money, but after WWI the situation changed and the former allies owed America more than US$ 10 Billion for the cost of armaments and food supplies.

After the WWI a decade of tremendous prosperity started. This economic boom was a consequence of the mass production industries increasing gross domestic products, productivity and income, so business sales increase, driving up profits.  

New Deal is the name given by the president of the United States Franklin D. Roosevelt to his interventionist policy set in motion to fight against the effects of the Great Depression in the United States. This program was developed between 1933 and 1938 with the objective of supporting the poorest layers of the population, reforming financial markets and revitalizing a wounded American economy since the crash of 1929 due to unemployment and bankruptcies.

A first, particularly marked by the "One Hundred Days of Roosevelt" in 1933, which pointed to an improvement in the situation in the short term.  Bank reform laws, urgent social assistance programs, work aid programs, or even agricultural programs. The Government made important investments and allowed access to financial resources through the various government agencies. The economic results were moderate, but the situation improved.The "Second New Deal" extended between 19353 and 1938, putting forward a new distribution of resources and power on a broader scale, with trade union protection laws, the Social Security Law, as well as aid programs for farmers and street workers.