Which policies of republican presidents contributed to the economic boom during the roaring twenties?

Answer: They lowered taxes, which meant businesses had more money to invest and the public had more money to spend on consumer items.

They put tariffs on imported goods so American products would be bought by consumers because they were cheaper than their foreign rivals.

Answer and Explanation:

Summary and Definition: The economic boom of the 1920s in American history was a period often referred to as the roaring twenties. This period of economic recovery was marked by rapid industrial growth and technological development. The economic boom of the 1920s meant an increase in productivity, sales, and wages, along with the growing demand for consumer products, which resulted in enormous profits for businesses and companies.

US economic policy was heavily influenced by the policies of the Mellon Plan, when Andrew Mellon, the secretary of the Treasury, introduced policies that lowered US wealth and corporate tax in America, which boosted economic growth and economic recovery and increased stock market investment.

The reasons for the economic boom of the 1920s were Republican government policies of isolation and protectionism, the Mellon Plan, the order and mass production of consumer products such as the Ford Model T Automobile and luxury ball savers, and installment plans for easy access to credit.