The Edwardian Age saw political and social changes in England. King Edward VII helped negotiate foreign policy and founded the Order of Merit in 1902. The Liberals were elected in 1906 and created welfare programs. This period also saw industrial unrest, with strikes over high prices and low wages, as well as the suffragette movement fighting for women's right to vote. Edward VII was succeeded by King George V in 1910. World War I began in 1914 and involved the Central Powers versus the Triple Entente. "Shell shock" referred to the psychological effects of shell explosions. The U.S. joined the war in 1917. The war ended with the 1918 armistice and 1919 Treaty of Versailles.