In 1895 Wells established himself as a novelist in 1895 with his science fiction story, The Time Machine. Wells also became very popular in the United States. The popular magazine Cosmopolitan serialised two of his books, The War of the Worlds (1897) and First Man in the Moon (1900). His work also appeared in Collier's Magazine, the New Republic and the Saturday Evening Post. Wells also began writing non-fiction books about politics, technology and the future. This included Anticipations of the Reaction of Mechanical and Scientific Progress Upon Human Life and Thought (1901), The Discovery of the Future (1902) and Mankind in the Making (1903). These books impressed the three leaders of the Fabian Society, George Bernard Shaw, Sidney Webb and Beatrice Webb. Wells accepted their suggestion that he should join the society. Once a member of the Fabian Society, Wells tried to change it. Rather than a small group of intellectuals discussing socialist reform, Wells thought that it should be a large pressure group agitating for change. When the existing leadership resisted these ideas, Wells attempted to gain control of the organisation. Wells managed to gain election to the Fabian Society's Executive Committee but gained little support for change from the rest of the group. Wells resigned from the Fabian Society in 1908 but continued to be active in the campaign for socialism. His book A Modern Utopia expressed a desire for a society that was run and organised by humanistic and well-educated people. Wells, who was extremely critical of the role that privilege and hereditary factors in capitalist society and in his utopia, people gain power as a result of their intelligence and training. In his early scientific writings Wells predicted the invention of modern weapons such as the tank and the atom bomb. He was therefore horrified by the outbreak of the First World War. Unlike many socialists, he supported Britain's involvement in the war, however, he believed politicians should use this opportunity to create a new world order.