One could date the beginning of the twentieth century somewhat arbitrarily with 1900, or some similar date, or with the outbreak of World War I in 1914. The dating employed here views the decade or so between 1900 and 1914 as a bridge between the nineteenth and twentieth centuries. While the characteristics of Britain, the United States, and the Continental countries varied in degree during the last two centuries, the cultural core did not alter appreciably, irrespective of the changing economic and political circumstances.