Mo. Rev. Stat. § 72.330

The municipality which absorbs the other municipalities shall assume and be responsible and liable for all the liabilities and obligations of each of the municipalities being absorbed. Any claim existing or action or proceeding pending by or against any of the municipalities being absorbed may be prosecuted to judgment as if the absorption had not taken place, or the municipality which has absorbed the other municipality may be substituted in its place. Neither the rights of creditors nor any liens upon the property of any municipality which is absorbed shall be impaired by reason of the absorption.