United States Constitutional Law guides law students, political science students, and engaged citizens through the complexities of U.S. Supreme Court doctrine—and its relationship to constitutional politics—in key areas ranging from federalism and presidential power to equal protection and substantive due process. Rather than approach constitutional law as a static structure or imagine the Supreme Court as acting in isolation from society, the book elaborates and clarifies key constitutional doctrines while also drawing on scholarship in law and political science that relates the doctrines to large social changes such as industrialization, social movements such as civil rights and second-wave feminism, and institutional tensions between governmental actors. Combining legal analysis with historical narrative and sensitivity to political context, the book provides deeper understanding of how constitutional law arises, functions, and changes in a complex, often-divided society.