The 1920s saw social and economic changes in the United States. The period after WWI was characterized by isolationism, as seen in laws restricting immigration and the Red Scare targeting radicals. Culturally, the decade witnessed the rise of new technologies like automobiles, movies, radio and their impact on American life and values. The booming economy of the decade was fueled by mass consumption and consumer credit, but was unstable due to stock market speculation and an overheated real estate market, setting the stage for the Great Depression.