Republicans in Wisconsin tilted district maps in their favor in order to hamper Democrats and ultimately win state elections in 2012 and 2014, a federal court said on Monday in a case that could influence future rulings on gerrymandering.

The United States District Court for the Western District of Wisconsin decided 2-1 that Act 43, a redrawing of districts approved by the state's Republican-led legislature in 2012, violated the U.S. Constitution, court documents showed.