The Illinois General Assembly was created by the first
state constitution adopted in 1818. Initially, the state did not have organized political parties, but the Democratic and
Whig parties began to form in the 1830s. Future U.S. President
Abraham Lincoln successfully campaigned as a member of the Whig Party to serve in the General Assembly in 1834. He served four successive terms 1834–42 in the
Illinois House of Representatives, supporting expanded suffrage and economic development. He later went to the presidency as part of then new Republican Party. In 1877,
John W. E. Thomas was the first African American elected to the legislature. In 1922,
Lottie Holman O'Neill was elected to the
Illinois House of Representatives, becoming the first woman to serve in the Illinois General Assembly. Future U.S. President
Barack Obama was elected to the
Illinois Senate in 1996, serving there until 2004 when he was elected to the
United States Senate.
Size over time The size of the General Assembly has changed over time. The
first General Assembly, elected in 1818, consisted of 14 senators and 28 representatives. Under the
1818 and
1848 Illinois Constitutions, the legislature could add and reapportion districts at any time, and by 1870 it had done so ten times. Under the
1870 Illinois Constitution, Illinois was divided into 51 legislative districts, each of which elected one senator and three representatives. The representatives were elected by
cumulative voting, in which each voter had three votes that could be distributed among one, two, or three candidates. Due to the unwillingness of
downstate Illinois to cede power to the growing Chicago area, the district boundaries were not redrawn from 1901 to 1955. After voters approved the
Legislative Apportionment Amendment in 1954, there were 58 Senate districts and 59 House districts, which did not necessarily coincide. This new arrangement was conceived as a "little federal" system: the Senate districts would be based on
land area and would favor downstate, while the House districts would be based on population. House members continued to be elected by cumulative voting, three from each House district. With the adoption of the
1970 Illinois Constitution, the system of separate House and Senate districts was eliminated, and legislative districts were apportioned on a
one person, one vote basis. The state was divided into 59 legislative districts, each of which elected one senator and three representatives. The cumulative voting system was abolished by the
Cutback Amendment in 1980. Since then, the House has been elected from 118 single-member districts, which are formed by dividing each of the 59 Senate districts in half. Each senator is "
associated" with two representatives. ==Terms of members==