Mass transit has been part of the urban scene in the United States since the early 19th century. Regular steam ferry service began in New York City in the early 1810s and horse-drawn omnibuses plied city streets starting in the late 1820s. Expanding networks of horse railways emerged by the mid-19th century. The electric streetcar became the dominant mass transit vehicle a half century later. During this era, mass transit had a significant impact on American urban development. Mass transit’s importance in the lives of most Americans started to decline with the growth of automobile ownership in the 1920s, except for a temporary rise in transit ridership during World War II. In the 1960s, congressional subsidies began to reinvigorate mass transit and heavy-rail systems opened in several cities, followed by light rail systems in several others in the next decades. Today concerns about environmental sustainability and urban revitalization have stimulated renewed interest in the benefits of mass transit.
Since the social sciences began to emerge as scholarly disciplines in the last quarter of the 19th century, they have frequently offered authoritative intellectual frameworks that have justified, and even shaped, a variety of U.S. foreign policy efforts. They played an important role in U.S. imperial expansion in the late 19th and early 20th centuries. Scholars devised racialized theories of social evolution that legitimated the confinement and assimilation of Native Americans and endorsed civilizing schemes in the Philippines, Cuba, and elsewhere. As attention shifted to Europe during and after World War I, social scientists working at the behest of Woodrow Wilson attempted to engineer a “scientific peace” at Versailles. The desire to render global politics the domain of objective, neutral experts intensified during World War II and the Cold War. After 1945, the social sciences became increasingly central players in foreign affairs, offering intellectual frameworks—like modernization theory—and bureaucratic tools—like systems analysis—that shaped U.S. interventions in developing nations, guided nuclear strategy, and justified the increasing use of the U.S. military around the world.
Throughout these eras, social scientists often reinforced American exceptionalism—the notion that the United States stands at the pinnacle of social and political development, and as such has a duty to spread liberty and democracy around the globe. The scholarly embrace of conventional political values was not the result of state coercion or financial co-optation; by and large social scientists and policymakers shared common American values. But other social scientists used their knowledge and intellectual authority to critique American foreign policy. The history of the relationship between social science and foreign relations offers important insights into the changing politics and ethics of expertise in American public policy.