What were the factor that contributed to the crises of the depression? please Help ASAP!!

The causes of the Great Depression included the stock market crash of 1929, bank failures, and a drought that lasted throughout the 1930s. During this time, the nation faced high unemployment, people lost their homes and possessions, and nearly half of American banks closed.

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an expansion is one of two basic business cycle phases; the other is contraction. the transition from expansion to contraction is a peak, and the changeover from contraction to expansion is a trough.