The 12th New York State Legislature, consisting of the New York State Senate and the New York State Assembly, met from December 11, 1788, to March 3, 1789, during the twelfth year of George Clinton's governorship, in Albany.

Under the provisions of the New York Constitution of 1777, the State Senators were elected on general tickets in the senatorial districts, and were then divided into four classes. Six senators each drew lots for a term of 1, 2, 3 or 4 years and, beginning at the election in April 1778, every year six Senate seats came up for election to a four-year term. Assemblymen were elected countywide on general tickets to a one-year term, the whole assembly being renewed annually.

In March 1786, the Legislature enacted that future Legislatures meet on the first Tuesday of January of each year unless called earlier by the governor. No general meeting place was determined, leaving it to each Legislature to name the place where to reconvene, and if no place could be agreed upon, the Legislature should meet again where it adjourned.

The State election was held from April 29 to May 1, 1788. Senators Ezra L'Hommedieu (Southern D.) and Peter Van Ness (Western D.) were re-elected; and Paul Micheau, Isaac Roosevelt (both Southern D.), and Assemblyman James Clinton (Middle D.) were also elected to the Senate. Assemblyman Edward Savage (Eastern D.) may have been elected at the same time to the State Senate (Eastern D.) and to the Assembly (Washington Co.) but was seated in the Assembly; the Senate seat vacated by the expiration of Ebenezer Russell's term remained vacant.

At the same time, delegates to a Convention to deliberate upon the adoption of the U.S. Constitution were elected. This was the first time that the politicians were divided into two opposing political parties: those who advocated the creation of a stronger federal government and the adoption of the US Constitution, as drafted, were henceforth known as Federalists, those who advocated stronger State governments and demanded many changes to the proposed Constitution as Anti-Federalists, or Democratic-Republicans.

...
Wikipedia