4: 1. Stock Market Crash of 1929, Bank Failures, Reduction in Purchasing Across the Board, American Economic Policy with Europe, and Drought Conditions. 2. in most countries it started in about 1929 and lasted until the late 1930s or early 1940s 3. life was hard for all levels of family especially lower class. 4. the Depression Affected Children 1 of 3 Homeless Family. 5. The great depression ended when world war 2 ended .