United States Constitution Sixteenth Amendment

The Sixteenth Amendment authorized a federal income tax in 1913, extending the federal government’s capacity to raise revenue. The book places its ratification within the Progressive era’s broader effort to strengthen public oversight of corporations and financial power, showing how political reform could expand both the state’s resources and its ability to regulate the economy.

Progressive reform and federal power

The amendment emerged amid mounting efforts to challenge corporate concentration. Theodore Roosevelt had used the Sherman Act to break up the Northern Securities Company in 1902, affecting the interests of J.P. Morgan; subsequent suits targeted Du Pont, the American Tobacco Company, and Standard Oil. Roosevelt also strengthened federal oversight of railways through the Hepburn Act of 1906, which empowered the Interstate Commerce Commission to inspect railway accounts and extended its authority into new areas.

Roosevelt’s successor, William Taft, pursued trust prosecutions even more vigorously. The breakup of Standard Oil in 1911 was a high point of that campaign. Taft also promoted the federal income tax, which arrived through ratification of the Sixteenth Amendment in 1913. The amendment thus belonged to a reform sequence in which federal action increasingly reached into the operations of large corporations and the sources of their power.

Ratification and the expanding state

The amendment’s fiscal importance lay in its addition of a federal income tax to the government’s revenue-raising powers. The book presents this change as one of Taft’s important reforms, alongside efforts to restrain corporate trusts. Its significance is therefore institutional as well as fiscal: the federal government gained a further means to finance its work at a moment when reformers were pressing for stronger national oversight.

That expansion continued under Woodrow Wilson, elected in 1912. In 1914, Wilson secured passage of the Clayton Antitrust Act, which strengthened the Sherman Act, and created the Federal Trade Commission to enforce the new law. The investigation by the Pujo Committee into the spread of monopoly in finance—the so-called money trust—also helped spur Wilson to establish the Federal Reserve Board in 1913 to regulate monopolistic activity in the financial sector. Together, these measures show the wider Progressive project in which the amendment was embedded: a more capable federal government, equipped to collect revenue and to confront concentrated economic power.