Robert Frost was the most widely admired and highly honoured American poet of the 20th century. Amy Lowell thought he had overstressed the dark aspects of New England life, but Frost's later flood of more uniformly optimistic verses made that view seem antiquated. Louis Untermeyer's judgment that the dramatic poems in North of Boston were the most authentic and powerful of their kind ever produced by an American has only been confirmed by later opinions. Gradually, Frost's name ceased to be linked solely with New England, and he gained broad acceptance as a national poet.It is true that certain criticisms of Frost have never been wholly refuted, one being that he was overly interested in the past, another that he was too little concerned with the present and future of American society. Those who criticize Frost's detachment from the "modern" emphasize the undeniable absence in his poems of meaningful references to the modern realities of industrialization, urbanization, and the concentration of wealth, or to such familiar items as radios, motion pictures, automobiles, factories, or skyscrapers. The poet has been viewed as a singer of sweet nostalgia and a social and political conservative who was content to sigh for the good things of the past.