Mississippi Territory: Polity Style: 1798-1817

25 Apr 1796	the territory east of the River Mississippi in dispute between the United States and Spain is confirmed to lie within the boundaries of the United States in accordance with a treaty signed by the plenipotentiaries of the United States and the King of the Spains at San Lorenzo el Real on 27 Oct 1795, effective upon the exchange of ratifications at Aranjuez on 25 Apr 1796 (United States Treaty Series, 2:318-345; Statutes at Large, 8:138-153)
7 Apr 1798	the Mississippi Territory is constituted as a territory of the United States in accordance with an act passed by the Congress of the United States (Senate on 5 Mar 1798, House of Representatives on 27 Mar 1798 with amendments, Senate concurred in amendments on 29 Mar 1798) and signed into law on 7 Apr 1798 (Statutes at Large, 1:549-550) [1]
18 Aug 1798	the territorial government is established with the reading of the act of Congress and governor's commission at a public meeting in Natchez (Mississippi Territorial Archives, 1:25-29)
18 Aug 1798 - 15 Aug 1817	Mississippi Territory
1 Mar 1817	the inhabitants of the western part of the Mississippi Territory are authorized to form a constitution and state government and to assume a name for the future State, to be admitted to the United States when formed, in accordance with an act passed by the Congress of the United States (Senate on 31 Jan 1817, House of Representatives on 26 Feb 1817 with amendments, Senate concurred in amendments on 27 Feb 1817) and signed into law on 1 Mar 1817 (Statutes at Large, 3:348-349) [2]
15 Aug 1817	the Constitution of the State of Mississippi is adopted at a session of the Convention held at the town of Washington on 12 Aug 1817 and signed on 15 Aug 1817 (Mississippi Convention 1817, pp. 101-103, 105-106) [3]

Full title: An act for an amicable settlement of limits with the state of Georgia, and authorizing the establishment of a government in the Mississippi territory.
Full title: An act to enable the people of the western part of Mississippi Territory to form a constitution and State government, and for the admission of such State into the Union, on an equal footing with the original States.
Following the adoption of the Constitution of the State of Mississippi, all officers civil and military, holding commissions under the authority of the United States or of the Territory of Missouri, were authorized by a provision of the Constitution to continue in office until superseded.