(65 ILCS 20/21-42) (from Ch. 24, par. 21-42)

Sec. 21-42.

Redistricting ordinance submitted - When in effect.

If the question of the adoption of one of two or more redistricting
ordinances is submitted to the voters at any election, the ordinance for
which the highest number of votes is cast shall be deemed approved and
shall thereupon be in force and effect. If the question of the adoption of
but one such ordinance is submitted at any election and a majority of the
votes cast thereon are for the adoption of such ordinance, it shall
thereupon be in force and effect; otherwise such ordinance shall not go
into effect.

(Source: Laws 1941, vol. 2, p. 19.)