"When Joseph Pulitzer purchased the New York World in May, 1883, a typical front page consisted of a half-dozen columns of densely packed type, unrelieved by illustrations or eye-catching headlines... All that changed the moment Joseph Pulitzer got hold of it. An immigrant himself, Pulitzer saw himself as a champion of the weak and oppressed. The World, as he conceived it, would be a paper 'dedicated to the cause of the people rather than to that of the purse potentates.' …His method of achieving these lofty aims was to appeal to his reader’s lowest instincts. After all, he reasoned, the best a publisher could do was to 'go for a million circulation, and when you have got it, turn the minds and the votes of your readers one way or the other at critical moments.' And the most effective way to reach that million circulation was by printing the kind of wildly sensationalistic stories that ordinary people have always gobbled up... By March, 1885, the World had a daily circulation of more than 150,000 copies – an astonishing tenfold increase in less than two years. That figure would double again before the end of the decade. The age of 'yellow journalism' had arrived."
For more on the World building and Joseph Pulitzer, check out this excerpt from Harold Schechter's The Devil's Gentleman in Gotham: A Blog for Scholars of New York City History.