At the beginning of the Revolutionary War, Burr took part in the invasion of Canada and the failed attempt to capture Quebec. Burr also participated in the Manhattan skirmishes and the Battle of Monmouth. After the war, he served in the New York State Assembly and then served as attorney general for two years. In 1791, he was elected as New York senator, defeating incumbent General Philip Schuyler, Alexander Hamiltion's father-in-law. Burr served as senator for six years, then spent two more years in the New York State Assembly from 1798 to 1799. He ran in the presidential election of 1800, along with Thomas Jefferson, incumbent John Adams, John Jay, and Charles Cotesworth Pinckney. Under the system at that time, the recipient of the majority of the votes was elected president, while the runner-up became vice president. Burr tied with Jefferson in the Electoral College, and then Jefferson was chosen as president by the House of Representatives. In 1804, when Jefferson was running for re-election, he dropped Burr from his ticket, so Burr ran for the governorship of New York. During Burr's campaign, Alexander Hamilton defamed him in the press. The insulted Burr challenged Hamilton to a duel: Hamilton accepted, and Burr killed Hamilton on 11 July 1804.

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