The 1900s refers to the time period between January 1, 1900, and December 31, 1999. It encompasses various historical events, cultural shifts, and political changes that shaped the United States during this century.
Related terms
Progressive Era: A period in American history (roughly early 1900s) marked by social reform movements aimed at addressing societal problems caused by industrialization.
World War I: A global conflict fought from 1914 to 1918 involving many countries including the United States.
Great Depression: An economic crisis lasting from around late 1929 to the early years of World War II characterized by high unemployment rates and severe financial hardships.