The early 20th century, spanning from 1900 to 1945, was a period 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. Major events included World War I, which lasted from 1914 to 1918, and the Great Depression, a severe worldwide economic downturn that began in 1929. During this time, advancements in technology and communication emerged, such as the invention of the automobile and the radio. The early 20th century also witnessed the emergence of new cultural movements, including modernism in art and literature, which challenged traditional forms and embraced innovation.