Answer:
The USA's world position after the First World War. It was owed money by European countries, it had raw materials in abundance. Its economy was massively more secure than that of any other country's. Share confidence, assembly line, new technological knowledge. New affordable consumer goods, effective advertising.The rich and the middle classes got richer, the poor remained poor. In 1929, 1/3 of all income was received by 5% of the workforce.