105 ILCS 5/7-10.5
When dissolution and annexation become effective for purposes of administration and attendance as determined pursuant to Section 7-9 or 7-11 of this Code, as applicable, the positions of teachers in contractual continued service in the district being dissolved are transferred to an annexing district or to annexing districts pursuant to the provisions of subsection (h) of Section 24-11 of this Code relative to teachers having contractual continued service status whose positions are transferred from one school board to the control of a different school board, and those said provisions of subsection (h) of Section 24-11 of this Code shall apply to the transferred teachers. In the event that the territory is added to 2 or more districts, the decision on which positions are to be transferred to which annexing districts must be made giving consideration to the proportionate percentage of pupils transferred and the annexing districts' staffing needs, and the transfer of specific individuals into such positions must be based upon the request of those teachers in order of seniority in the dissolving district. The contractual continued service status of any teacher thereby transferred to an annexing district is not lost and the different school board is subject to this Code with respect to the transferred teacher in the same manner as if the teacher was that district's employee and had been its employee during the time the teacher was actually employed by the school board of the dissolving district from which the position was transferred.
105 ILCS 5/7-10.5