65 ILCS 5/7-2-26
The formation of a united city under Section 7-2-1 shall not effect a union of the schools in the boroughs of the united city. The united city before the schools themselves are united shall not be responsible for any school debt or any school obligation in a municipality that becomes a borough or in a borough after the formation of the united city. Each school in a borough, until the schools themselves are united, shall be governed, as far as possible, as if the united city had not been formed. Statutes providing that school officials may act only with the concurrence of the city council shall not apply to schools in a united city until the schools are united in compliance with statutes governing schools. However, after the formation of a united city, and before the school themselves are united, the name of each school district therein shall be amended by substituting the word "Borough" in place of the word "City," "Village," or "Town".
65 ILCS 5/7-2-26