Before the United States entered World War 1, they remained isolated from the rest of the world. Post WW1 the U.S. turned into a national creditor for other countries and handled the debts from the war. Germany could not pay any of their debts from the war, and the U.S. began to loan them money. In 1924 the United States created the Dawes Plan that provided loans to American allies and other countries with a reduce of yearly payments. In 1928/29 the U.S. stopped sending money overseas due to concerns of the American stock market. They created the Young Plan, which limited Germany's reparations, but it was too late. The stock market crashed and the Great Depression had begun and President Hoover declared that all countries pay their debts back to the United States, but none paid. To control high debts from other countries, America passed the Johnson Act that stopped loaning money to countries money that did not pay back. It did not work. Most Americans lost all of their money and 25% were unemployed. The United States Getting involved in the WWI and the world's problems caused an economic depression leaving millions without jobs, food, or housing.