The early 20th century refers to the period from 1900 to the 1940s, marked by significant social, political, and technological changes. This era saw the rise of industrialization, which transformed economies and led to urbanization as people moved to cities for work. Innovations like the automobile and radio changed daily life and communication. World events during this time included World War I (1914-1918) and the Great Depression (1929), which had profound effects on countries worldwide. The early 20th century also witnessed movements for women's suffrage and civil rights, laying the groundwork for future social changes.