On September 1, 1807, former Vice President Aaron Burr was acquitted of treason in Richmond, Virginia, following one of the most dramatic trials in early American history. Federal prosecutors had accused Burr of organizing an armed conspiracy involving western territory and Spanish possessions in North America.
The Constitution defines treason narrowly, requiring either levying war against the United States or aiding its enemies, as well as proof of an overt act. Chief Justice John Marshall ruled that the government had not produced sufficient evidence that Burr himself had committed such an overt act of war.
The case also raised major questions about presidential power. Earlier in the trial, Burr’s lawyers sought documents from President Thomas Jefferson, prompting a conflict over executive authority and judicial process. Jefferson supplied some material while resisting the broader principle that a president could be compelled like an ordinary witness.
Burr left the trial legally cleared of treason, but his national political career never recovered.
