The Great Depression was felt all around the world. Germany had problems already, because it had lost World War I. The Depression made things worse.
Adolf Hitler said minority groups caused Germany’s troubles. He mostly blamed Jews and Communists. This made him very popular. In 1933, he became the nation’s ruler. He built up the military and planned to make his country powerful by taking over others.
In September 1939, Germany invaded Poland. That started World War II. The United States had said it wouldn’t take sides. But it was later drawn into the fight. War production, or making weapons and other materials for the military, is what finally brought the country out of the Great Depression.