In 1894 there was a union of all parties in New York City who were opposed to Tammany Hall, and W. L. Strong was elected Mayor. He invited Roosevelt to join his administration as head of one of the departments; first, as head of the Street-Cleaning Department, which he declined for lack of special knowledge; and second, as head of the Police Department, which he accepted. Some of his friends in Washington urged him not to accept the place on the ground that it was beneath his dignity; others urged him with even more vehemence to accept it, partly because of the good work he could do for New York in putting this department on an honest basis, and partly because of the opportunity it would afford him of getting on the firing-line in the contest for good government in cities. He held this office for two years, and though subjected to much criticism from certain quarters for enforcing the liquor-license law, yet it can be said, in a word, that during his administration he placed the department on a thoroughly efficient basis, broke up the organized system of blackmail which had hitherto prevailed in the department, and gained the affectionate admiration of the members of the force to an extent which has never been equalled by any Police Commissioner before or since. During the three years from 1894 to 1897 he wrote the greater part of the essays on political subjects which are printed in the volumes of _American Ideals_. In these will be found his whole theory of politics, based on honesty, courage, never-ending hard work, and fair play; and coupled with these a certain measure of expediency which, without sacrificing principle, strives to get things done, and to accept the second best if what he considers the first best is not attainable; realizing that in a government of universal suffrage many minds must be consulted and a majority of them brought to the same conclusion before anything can be accomplished.