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.

b) new machinery hope i

according to this text from the preamble to the declaration, who gives men their unalienable rights?