The economic boom of the 1920s was primarily caused by the

development of new consumer goods industries

Explanation: The Economic boom in the 1920s was a period often referred to as the Roaring Twenties. This period saw the beginning of the economic boom which was marked by rapid industrial growth and advances in technology. The Economic Boom saw increases in productivity, sales and wages accompanied by a rising demand for consumer products leading to massive profits for businesses and corporations.

The then Secretary of the Treasury, Andrew Mellon, introduced policies which reduced taxes on the wealthy and the businesses in America that encouraged growth such as the Assembly line, the mass production of consumer goods such as the Ford Model T Automobile and luxury labor saving devices. All these coupled with access to easy credit on installment plans rapidly drove the economy forward.

the government paid religious orders to provide basic education to native american children on reservations. in the late 19th and early 20th centuries, the bureau of indian affairs (bia) founded additional boarding schools based on the assimilation model of the off-reservation carlisle indian industrial school.

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.