The United States first organized
Wisconsin in 1787 under the
Northwest Ordinance after
Great Britain yielded the land to them in the
Treaty of Paris. It became the Wisconsin
Territory in 1836 and a
U.S. state on May 29, 1848. The 1850s saw an influx of European immigrants. The legislature was dominated alternately by two political parties in its first century: the
Republican and Progressive parties. In 1995, the Republican Party took control of the legislature for the first time since 1969, and have maintained their control of both houses since, except for a brief period between 2009 and 2011. In the
2016 Wisconsin elections, Republicans secured their largest majority in the Assembly since 1956, the party maintained their overwhelming control of the legislature despite receiving fewer total votes. Congressional districts have been disputed since at least 2016. After Republican Governor
Scott Walker then signed a
redistricting plan, at least one U.S. court found the districts to be unconstitutional partisan
gerrymandering. Other controversies include "prison gerrymandering," where prisons are counted towards the population of a district despite its inmates coming from elsewhere. On December 22, 2023, the
Wisconsin Supreme Court ruled in
Clarke v. Wisconsin Elections Commission that the state legislative maps violated the contiguity requirement of Article IV, Sections 4 and 5 of the
Constitution of Wisconsin. The Court ordered the legislature to draw new maps ahead of the
2024 Wisconsin elections. ==Membership==