105 ILCS 5/7-7.7

The proposition for the annexation of all of the territory of one or more school districts to another school district shall be submitted to the voters of the annexing district and the voters of each district all of the territory of which is to be annexed to the annexing district, and if a majority of the voters in each such district who vote on the proposition vote in favor of the proposition, the proposition shall be deemed to have passed.