In The Spirit of the Constitution, David S. Schwartz tells the story of the decision's long-term impact and the evolution of Justice Marshall's reputation. By tracing the rich history of McCulloch's influence from 1819 to the present, he shows that its meaning-and significance-for judges, political leaders, and the public varied greatly over time. The case was alternately celebrated, denounced, ignored, and reinterpreted to suit the needs of the moment. While Marshall was never reviled, he was not seen as especially influential until the late nineteenth century. Competing parties utilized McCulloch in constitutional debates over national power in the early republic; over the question of slavery in the late antebellum period; and over Congress's role in regulating the economy and civil rights in the twentieth century. Even after McCulloch's meaning seemed fixed by the mid-twentieth century, new debates about its implications have emerged in recent times. Schwartz's analysis of McCulloch's remarkable impact reaffirms the case's importance and unveils the circuitous process through which American constitutional law and ideology are made.