Why did banks close after the stock market crash of 1929?

Banks closed after the Stock Market crash of 1929 primarily due to a loss of confidence and a liquidity crisis. Many banks had invested heavily in the stock market and suffered significant losses, leading to insolvency. As depositors rushed to withdraw their savings, banks faced a run, depleting their cash reserves and forcing them to shut down. This exacerbated the economic downturn and contributed to the Great Depression.