Rise of merchants, idea of where wealth equals power. Mercantilism to capitalism. Factors such as Social Darwinism, nationalism, and the civilizing mission were factors that contributed to imperialism in this period.
KAY GALLANT: Most Americans approved strongly of the economic growth and improved living conditions during the nineteen twenties. They supported the conservative Republican policies of President Calvin Coolidge. And they had great faith in the country's business leaders and economic system.
HARRY MONROE: The spirit of protest was especially strong in serious American writing during the nineteen twenties. Many of the greatest writers of this period hated the new business culture.
BOB DOUGHTY: Welcome to THE MAKING OF A NATION – American history in VOA Special English.
If you're talking about WWI then their military was restricted heavily, they had war reparations, and all of this was topped off with out of control debt and inflation. Essentially, everyone was mad and poor.