Early 20th century c 1900 to c 1950

Spain: End of the Monarchy (c 1900 to c 1931) Italy: Giolittian period (1900–1914) c 1900 to c 1909 USA: The Progressive Era (c 1890–1929) c 1910 to c 1919 c 1940 to c 1949 Inter-war period c 1919 to c 1939