List of United States Supreme Court cases, volume 31

This is a list of cases reported in volume 31 (6 Pet.) of United States Reports, decided by the Supreme Court of the United States in 1832.

Nominative reports
In 1874, the U.S. government created the United States Reports, and retroactively numbered older privately-published case reports as part of the new series. As a result, cases appearing in volumes 1–90 of U.S. Reports have dual citation forms; one for the volume number of U.S. Reports, and one for the volume number of the reports named for the relevant reporter of decisions (these are called "nominative reports").

Richard Peters, Jr.
Starting with the 26th volume of U.S. Reports, the Reporter of Decisions of the Supreme Court of the United States was Richard Peters, Jr. Peters was Reporter of Decisions from 1828 to 1843, covering volumes 26 through 41 of United States Reports which correspond to volumes 1 through 16 of his Peters's Reports. As such, the dual form of citation to, for example, Kelly v. Jackson is 31 U.S. (6 Pet.) 622 (1832).

Justices of the Supreme Court at the time of 31 U.S. (6 Pet.)
The Supreme Court is established by Article III, Section 1 of the Constitution of the United States, which says: "The judicial Power of the United States, shall be vested in one supreme Court . . .". The size of the Court is not specified; the Constitution leaves it to Congress to set the number of justices. Under the Judiciary Act of 1789 Congress originally fixed the number of justices at six (one chief justice and five associate justices). Since 1789 Congress has varied the size of the Court from six to seven, nine, ten, and back to nine justices (always including one chief justice).

When the cases in 31 U.S. (6 Pet.) were decided, the Court comprised these seven justices:

Worcester v. Georgia
In Worcester v. Georgia, 31 U.S. (6 Pet.) 515 (1832), the Supreme Court held that the Georgia criminal statute that prohibited non-Native Americans from being present on Native American lands without a license from the state was unconstitutional. The opinion by Chief Justice John Marshall is most famous for its dicta, which laid out the relationship among tribes, state governments, and the federal government. The decision is considered to have built the foundations of the doctrine of tribal sovereignty in the United States. Marshall laid out in this opinion that the relationship between the Indian Nations and the United States is that of nations. He reasoned that the United States, in the character of the federal government, inherited the legal rights of The Crown. Those rights, he stated, included the sole right to negotiate with the Indian nations of North America, to the exclusion of all other European powers. This did not include the rights of possession to their land or political dominion over their laws. He acknowledged that the exercise of conquest and purchase can give political dominion, but that those are in the hands of the federal government, and individual states had no authority in American Indian affairs.

Citation style
Under the Judiciary Act of 1789 the federal court structure at the time comprised District Courts, which had general trial jurisdiction; Circuit Courts, which had mixed trial and appellate (from the US District Courts) jurisdiction; and the United States Supreme Court, which had appellate jurisdiction over the federal District and Circuit courts—and for certain issues over state courts. The Supreme Court also had limited original jurisdiction (i.e., in which cases could be filed directly with the Supreme Court without first having been heard by a lower federal or state court). There were one or more federal District Courts and/or Circuit Courts in each state, territory, or other geographical region.

Bluebook citation style is used for case names, citations, and jurisdictions.
 * "C.C.D." = United States Circuit Court for the District of . ..
 * e.g.,"C.C.D.N.J." = United States Circuit Court for the District of New Jersey
 * "D." = United States District Court for the District of . ..
 * e.g.,"D. Mass." = United States District Court for the District of Massachusetts
 * "E." = Eastern; "M." = Middle; "N." = Northern; "S." = Southern; "W." = Western
 * e.g.,"C.C.S.D.N.Y." = United States Circuit Court for the Southern District of New York
 * e.g.,"M.D. Ala." = United States District Court for the Middle District of Alabama
 * "Ct. Cl." = United States Court of Claims
 * The abbreviation of a state's name alone indicates the highest appellate court in that state's judiciary at the time.
 * e.g.,"Pa." = Supreme Court of Pennsylvania
 * e.g.,"Me." = Supreme Judicial Court of Maine