What did the world economy depend on the strength if the U.S. economy in the 1920s?

In the 1920s, the world economy heavily relied on the strength of the U.S. economy due to America's position as a leading industrial power and its role as a major lender and investor abroad. U.S. prosperity fueled global trade, as American goods and investments were crucial for many countries recovering from World War I. Additionally, the U.S. dollar became the dominant currency for international transactions, further intertwining the global economy with American economic performance. The subsequent Stock Market crash in 1929 highlighted this dependency, leading to widespread economic turmoil worldwide.