Courts, both state and federal, often play a substantial role in the adoption and implementation of changes in public policy. Properly understood, the impact of court decisions must be examined in the context of actions and reactions by other branches of government, political parties, and interest groups. Among the most transformative court decisions over the last half century are those involving legislative reapportionment and minority voting rights. Beginning in the 1960s, the federal courts restructured the nation's political institutions through decisions striking down malapportioned legislatures and local governing bodies through what used to be termed the “reapportionment revolution,” perhaps the only revolution ignored altogether by historians. Shortly thereafter the courts extended their attack on quantitative vote dilution (which the “one-person, one-vote” standard is designed to address) to include protection against electoral rules that dilute the voting strength of racial minorities.