1901-09 - Theodore Roosevelt is US President; he works to reform business, railways, child labour, and to conserve natural resources
1903 - Panama secedes from Colombia with US backing
1903 - Boundary dispute over Alaska between Canada and United States settled
1904 - Final settlement between Bolivia and Chile after the War of the Pacific
1904-09 - Presidency of Ismael Montes in Bolivia; period of social and political reforms
1905 - Provinces of Alberta and Saskatchewan formed in Canada
1906 - Alaska elects a delegate to US Congress
1906 - Cuba occupied by US forces following a liberal revolt
1907 - Run on American banks checked by J P Morgan
1908 - Henry Ford produces first Model T car
1911 - President Diaz of Mexico overthrown
1912 - Alaska granted territorial status in United States
1912 - Arizona and New Mexico become US States
1912 - Secret ballot and universal suffrage introduced in Argentina
1913-21 - Woodrow Wilson is present of United States
1914 - Panama Canal opened
1914 - Completion of Grand Trunk Pacific Railway in Canada
1916-22 - Hipolito Irigoyen elected President of Argentina: extensive reforms
1917 - Mexico adopts a new constitution
1917 - Brazil declares war on Germany
1917 - United States declares war on Germany
1918 - Venezuela oilfields opened
1918 - US President Wilson puts forward the Fourteen Points for settling Word War I
19-20 - US Congress refuses to recognize League of Nations
1919-30 - Great material progress in Peru during Presidency of Augusto Legula
1920-33 - Prohibition against sale of alcohol in United States
1921-25 - Progressive Government of President Juan Bautista Saavedra in Bolivia
1922 - First portable radio and first car radio made in United States
1926 - Panama and United States agree to protect Panama Canal in wartime
1929 - US Wall Street Stock Exchange crashes; Great Depression follows
1930 - Getulio Vargas becomes Brazilian President and assumes dictatorial powers in 1937
1932 - Democrat Franklin D Roosevelt becomes US President
1932-35 - Chaco war between Bolivia and Paraguay
1933 - Peruvian President Sanchez Cherro assassinated by an “aprista”
1933 - US “New Deal” laws, such as National Industry Recovery Act, promote economic recovery
1935 - US Social Security Act – first step in creation of Welfare State
1937 - US National Labour Relations Act
1938 - Mexico takes over US and British oil companies in Mexico
1941 - US Congress passes Lend-Lease Act; billions of dollars’ worth of military hardware loaned to Allies
1944 - First free Presidential Elections in Guatemala
1945 - US scientists build first atomic bomb
1947 - In Truman Doctrine US Government promises aid to any Government resisting Communism
1948-51 - Under Marshall Plan, United States dispenses aid to Europe in help post-war recovery
1949 - United States and West European Nations set up North Atlantic Treaty Organization (NATO) for collective security
1950s - Black Americans intensify campaign for Civil Rights
1955 - Army officers seize power from Argentinian President Peron
1962 - Cuban missile crisis
1963 - US President John F Kennedy assassinated
1963 - Thousands march on Washington DC to press for Civil Rights for black Americans
1964 - Military leaders seize power in Brazil
1964 - US Civil Rights Act bans racial discrimination in federal funding and employment
1968 - Major protests in United States against Vietnam War
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