In the 1920s, what did businesses and industries do that caused the economy to slow down? they hired more workers. they stopped buying stocks. they bought stocks on margin. they overproduced goods.

The fourth answer is correct (D).

During the First World War the US was the largest supplier of manufactures, weapons and food to Europe, ie war warmed the American economy.

At the turn of the 1920s the US lived through the golden age, the American lifestyle was based on production and consumption. However, this excitement has led entrepreneurs to increase lending and increase their production, causing an overproduction that did not find demand for their products. This was the context that led the United States to the Great Depression of the 1930s.

i would think it's industries and hydroelectric power

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.