The periods from the end of World War I to 1929 could be accurately described as 'boom to bust'. Great new technologies such as the family automobile, talking pictures, radio, and commercial air service were being woven into American lives. Compared to pre-war standards Americans were confident and prosperous. Suddenly in October 1929 the bottom fell out of the stock market, precipitating the Great Depression. At the same time a new president started America on the road to recovery in 1932. By then Italy and Japan had started to invade other countries, and Germany was soon to follow an aggressive military policy. By 1939 Great Britain and France were at war with Germany, and through the Lend-Lease Program the United States began to build and ship war materials to our allies. Following the 1940 election, American industry began a steady growth, and with the attack on Pearl Harbor, the United States became the greatest industrial nation in the world.