Roosevelt’s early career showed him to be a dynamic leader with a Progressive agenda. Many Republican Party leaders disliked Roosevelt’s Progressive ideas and popular appeal and hoped to end his career with a nomination to the vice presidency—long considered a dead end in politics. When an assassin’s bullet toppled this scheme, Mark Hanna, a prominent Republican senator and party leader, lamented, “Now look! That damned cowboy is now president!”
As the new president, however, Roosevelt moved cautiously with his agenda while he finished out McKinley’s term. Roosevelt kept much of McKinley’s cabinet intact, and his initial message to Congress gave only one overriding Progressive goal for his presidency: to eliminate business trusts. In the three years prior to Roosevelt’s presidency, the nation had witnessed a wave of mergers and the creation of mega-corporations. To counter this trend, Roosevelt created the Department of Commerce and Labor in 1903, which included the Bureau of Corporations, whose job it was to investigate trusts. He also asked the Department of Justice to resume prosecutions under the Sherman Antitrust Act of 1890. Intended to empower federal prosecutors to ban monopolies as conspiracies against interstate trade, the law had run afoul of a conservative Supreme Court.
In 1902, Roosevelt launched his administration’s first antitrust suit against the Northern Securities Trust Company, which included powerful businessmen, like John D. Rockefeller and J. P. Morgan, and controlled many of the large midwestern railroads. The suit wound through the judicial system, all the way to the U.S. Supreme Court. In 1904, the highest court in the land ultimately affirmed the ruling to break up the trust in a narrow five-to-four vote. For Roosevelt, that was enough of a mandate; he immediately moved against other corporations as well, including the American Tobacco Company and—most significantly—Rockefeller’s Standard Oil Company.