Which 1929 event sparked a chain reaction that led to the great depression?

several things that led to the great depression. Ex: the dust bowl, stock market crash (black Tuesday), over farming, following the gold standards, hoarding money, etc.

Explanation:

mainly the stock market crash i believe so

Farmers worked hard to produce record crops and livestock. When prices fell they tried to produce even more to pay their debts, taxes and living expenses. In the early 1930s prices dropped so low that many farmers went bankrupt and lost their farms.