The document discusses the growth of government in the United States over time. It identifies key factors that have led to the expansion of government responsibilities from a small, predictable role pre-20th century to a more active role today. Restraints on government growth have relaxed as public opinion and elite views have changed. The political system has also changed, shifting from a small agenda and limited leadership in the past to a larger agenda and more interest groups today. This has resulted in both benefits and costs to an activist government.