1) In the 1920s, the US economy boomed as new technologies like cars, appliances, and electricity became widely available, fueled by easy credit. However, most Americans did not share equally in prosperity.
2) Underlying weaknesses emerged such as overproduction, low wages that prevented many from buying goods, and a reliance on unstable credit.
3) When the stock market crashed in 1929, it revealed that the US economy was not as strong as it seemed, and the imbalances precipitated the Great Depression.