Definition
Mississippi is one of the fifty states of the United States of America, admitted to the Union on December 10, 1817. In legal contexts, "Mississippi" refers to the state as a sovereign entity within the federal system — a party to litigation, a jurisdiction whose law governs disputes, and a body politic with its own constitution, legislature, courts, and administrative apparatus. As a state, Mississippi exercises sovereign powers reserved to the states under the Tenth Amendment, subject to federal constitutional constraints.
The name also designates the Mississippi River, one of the principal navigable waterways of North America. In legal contexts, the river functions as a boundary line between several states, a subject of interstate compact, a source of navigation and admiralty jurisdiction, and a resource governed by federal and state water law.
Why It Matters in Research
Researchers encounter "Mississippi" in legal sources in at least three distinct operational contexts, each requiring different navigational attention.
First, as a jurisdiction: Mississippi law — its statutes, common law, constitutional provisions, and procedural rules — governs disputes arising within the state. Researchers must distinguish between pre-statehood territorial law, antebellum Mississippi law (heavily shaped by slavery and the plantation economy), Reconstruction-era constitutional changes, and modern Mississippi law. The state has had multiple constitutions; the current constitution dates to 1890 and has been frequently amended. Pre-1890 sources require particular care.
Second, as a party: The State of Mississippi appears frequently as a named party in federal constitutional litigation, particularly in cases involving civil rights, education, voting rights, and sovereign immunity. When Mississippi is the named party in a federal court decision, researchers should check whether the holding was later superseded by subsequent federal or state action — the state's litigation history in the mid-twentieth century, in particular, generated significant doctrinal development that was then modified or reversed by later legislation.
Third, as a geographic marker — specifically the Mississippi River: The river serves as the legal boundary between several state pairs (Minnesota/Wisconsin, Iowa/Illinois, Missouri/Kentucky, Tennessee/Arkansas, Arkansas/Mississippi, Mississippi/Louisiana). Boundary disputes along navigable rivers raise questions about the thalweg doctrine, the low-water mark rule, and the effect of avulsion versus accretion on state lines. Federal admiralty and navigation jurisdiction attaches to the river as an interstate navigable waterway. Researchers working on riparian rights, interstate compacts, or admiralty cases should track which body of law governs: federal admiralty, state property law, or compact law.
The territorial history of Mississippi is also research-relevant. The original Mississippi Territory (organized 1798–1799, substantially reorganized 1800–1817) encompassed what are now both Mississippi and Alabama. Documents from the territorial period may be catalogued under either state name or under "Mississippi Territory" — researchers should not assume that a territorial-era document pertains only to the modern state of Mississippi.
Historical Dictionary Support
Bouvier's entry on Mississippi provides the essential territorial foundation. Bouvier records that the Mississippi Territory was authorized by act of Congress of April 7, 1798 (Bouvier's reference to "April 9, 1778" appears to reflect an error in the transcription; the operative organic act is generally cited to 1798), and that Georgia ceded the relevant territory to the United States on April 24, 1802. This cession resolved the long-running Yazoo land controversy, one of the more significant property law episodes of the early republic.
Bouvier's treatment is characteristically brief — a geographical and political identifier rather than a substantive legal entry. This is typical of how state names function in nineteenth-century law dictionaries: they orient the researcher to jurisdiction rather than define a legal doctrine. What Bouvier does not address — and what modern researchers must source elsewhere — is the post-statehood legal development, including Mississippi's secession ordinance of January 9, 1861, its post-Civil War readmission to the Union in 1870, and the constitutional restructuring of 1890 that established the framework still in effect.
Jurisdictional Note
Mississippi's state courts are organized under the 1890 constitution and subsequent statutory revision. The state has a Supreme Court and a Court of Appeals; the latter was established in 1995 to manage appellate caseload. Researchers working with Mississippi appellate decisions before 1995 will find all intermediate appeals decided by the Supreme Court. Mississippi follows the Erie doctrine in federal diversity cases; federal courts sitting in Mississippi apply Mississippi substantive law as interpreted by the Mississippi Supreme Court.