The major global impact of the 1929 Wall Street crash was the triggering of the Great Depression, which had devastating economic effects worldwide. The crash led to a massive decline in consumer confidence, resulting in decreased spending and investments. As banks failed and unemployment soared, international trade diminished dramatically. Countries became increasingly isolationist, withdrawing from global cooperation. The Great Depression also contributed to the rise of extremist political movements in several nations, setting the stage for significant historical events, including World War II. Ultimately, this financial crisis reshaped economic policies and practices globally, leading to regulations and safety nets in subsequent decades.