Built to Last: Why America’s Antitrust System Has Endured for More Than a Century

As the United States celebrates 250 years of independence, few areas of public policy better illustrate the country’s capacity for institutional durability and adaptability than antitrust law. Enacted in 1890, the Sherman Act remains the foundation of U.S. competition policy and enforcement despite profound economic transformations, from railroads and oil to digital platforms and artificial intelligence. The remarkable feature of the American antitrust system is not just its legacy, but that it remains effective after profound economic and technological changes. Its durability rests on an unusual combination: Congress added new institutions and enforcement tools, courts incorporated new economic learning, and the framework adheres to lasting foundational principles.

Lasting Principles

Enduring legal frameworks depend on principles that outlast the economic circumstances in which they were written. Enacted in response to the public’s mistrust of concentrated power in the railroad and other industries, the Sherman Act helped establish a broad commitment to preserving competitive markets and addressing anticompetitive harms. 

Congress intentionally avoided an exhaustive list of prohibited conduct. Instead, it drafted the Sherman Act in broad terms, leaving courts room to apply its principles to markets Congress could never have anticipated. As a result, while the economy has evolved through continued growth and technological innovation, so has antitrust law developed, and its principles remain as applicable today to artificial intelligence as they were to railroads and oil trusts over 130 years ago. The Supreme Court reinforced this approach in the landmark 1911 Standard Oil case, recognizing that antitrust law should focus on unreasonable restraints of trade rather than adopt rigid prohibitions that might become obsolete as markets change.

More than a century after its enactment, the Sherman Act remains the foundation of U.S. antitrust enforcement. Those principles have provided continuity while remaining relevant to new industries and technologies. Nearly a century after Standard Oil, the 2001 Microsoft case proved that antitrust enforcement under the Sherman Act remains fully capable of addressing competition issues in rapidly evolving technology markets. 

A Flexible and Evolving Toolkit

Congress strengthened American antitrust not by replacing the Sherman Act, but by building around it. The Clayton Act, the Federal Trade Commission Act, and later the Hart-Scott-Rodino Act each added new institutions or enforcement tools while preserving the statute’s core principles.

The Clayton Act of 1914 supplemented the Sherman Act by addressing practices such as anticompetitive mergers and exclusive dealing arrangements before they matured into entrenched monopolies. Enacted the same year, the FTC Act created the Federal Trade Commission, a specialized enforcement agency, and prohibited unfair methods of competition, recognizing that effective competition policy requires both legal rules and specialized expertise. This pattern of regulatory refinement rather than reinvention helps explain why the U.S. antitrust framework has remained effective and fit for purpose for more than a century.

Congress continued to modernize the antitrust framework throughout the twentieth century. The HSR Act established a premerger notification process, allowing enforcement agencies to review significant transactions before they are consummated, making merger enforcement more effective and predictable. While the Department of Justice Antitrust Division has been a key actor in antitrust enforcement since the enactment of the Sherman Act, the FTC, state attorneys general, federal courts, and private litigants have also become fundamental drivers of antitrust enforcement.

While the Department of Justice Antitrust Division has been a key actor in antitrust enforcement since the enactment of the Sherman Act, state attorneys general, federal courts, and private litigants have also become important drivers of enforcement activity. This division of authority reflects the broader American preference for checks and balances and has made the system particularly resilient. Congress has refined the framework when necessary, but without abandoning the core principles that have guided U.S. antitrust law since 1890. This pattern of regulatory refinement, rather than reinvention, helps explain why the U.S. antitrust framework has remained effective and fit for purpose for more than a century.

Evidence-Based Adaptability

Perhaps the U.S. framework’s greatest strength is that it has incorporated evolving ideas about competition and how to evaluate it without requiring Congress to start over. The most consequential change in modern American antitrust came not from Congress, but from economics. Notably, Robert Bork’s “The Antitrust Paradox” helped shift antitrust toward a greater focus on consumer welfare and measurable competitive effects. While debates continue over the precise objectives of antitrust law and the original intent of the Sherman Act, better economic understanding has encouraged courts and agencies to evaluate conduct based on demonstrable evidence and likely competitive effects, rather than on structural assumptions alone.

While antitrust statutes have remained largely unchanged, courts and agencies’ interpretations of the statutes have adapted to reflect new ideas and economic findings. As competition laws and regimes have spread around the world, many of the analytical tools used by competition agencies have been refined by decades of antitrust practice in the U.S. Through organizations such as the OECD and the International Competition Network, competition authorities increasingly exchanged best practices and converged around evidence-based approaches to competition policy, with the U.S. agencies playing a leading role in shaping these global debates.

The same framework that once addressed competition concerns in the telecommunications, transportation, and manufacturing industries has adapted to evaluate conduct in software, digital platforms, cloud computing, and artificial intelligence. Recent enforcement actions against technology sector firms demonstrate that courts continue to apply longstanding antitrust principles to new technologies and business models.

As the United States marks its 250th birthday, the history of American antitrust offers a useful reminder: durable institutions are not static. For nearly 136 years, the American antitrust framework has accommodated changing enforcement philosophies, absorbed new economic learning, and confronted entirely new technologies without requiring Congress to rebuild it from scratch. While many countries now have competition laws, the uniquely American achievement is not simply having enacted antitrust first, but having built a framework that has remained recognizable, effective, and influential across more than a century of economic and technological transformation.