Among the many bills he drove through the Assembly was a measure, worked out with labor leader Samuel Gompers, to regulate tenement workshops.Roosevelt's last term was marred by the sudden deaths of his mother and his wife within hours of one another in February 1884. After the legislative session ended, he established Elkhorn ranch on the Little Missouri River in the Dakota Territory. Immersing himself in history, he completed Thomas Hart Benton (1886) and Gouverneur Morris (1887) and began to prepare his major work, the four-volume Winning of the West (1889-1896). A tour de force distinguished more for its narrative power and personality sketches than its social and economic analysis, it won the respect of the foremost academic historian of the West, Frederick Jackson Turner. It also gave Roosevelt considerable standing among professional historians and contributed to his election as president of the American Historical Association in 1912. Meanwhile, he published numerous hunting and nature books, some of high order.Politics and a romantic interest in a childhood friend, Edith Carow, drew Roosevelt back east. Nominated for mayor of New York, he waged a characteristically vigorous campaign in 1886 but finished third. He then went to London to marry Carow, with whom he had four sons and a daughter. In 1889, Roosevelt was rewarded for his earlier services to President Benjamin Harrison with appointment to the ineffectual Civil Service Commission. Plunging into his duties with extraordinary zeal, he soon became head of the Commission. He insisted that the laws be scrupulously enforced in order to open the government service to all who were qualified, and he alienated many politicians in his own party by refusing to submit to their demands. By the end of his six years in office Roosevelt had virtually institutionalized the civil service.Roosevelt returned to New York City in 1895 to serve two tumultuous years as president of the police board.