Mo. Rev. Stat. § 506.210 : CIVIL PROCEDURE AND LIMITATIONS — Commencement of Actions and General Provisions —ACTIONS AGAINST NONRESIDENT MOTORISTS — Use of highways by nonresidents shall constitute an agreement

The use and operation of a motor vehicle or trailer in this state on the public highways thereof by a person who is a nonresident of this state shall be deemed:

(1) An agreement by him that he, his executor, administrator or other legal representative shall be subject to the jurisdiction of the courts of this state in all civil actions and proceedings brought against him, his executor, administrator or other legal representative by either a resident or a nonresident plaintiff, for damages to person or property, including actions for death, growing or arising out of such use and operation; and
(2) An appointment by such nonresident, his executor, administrator or other legal representative of the secretary of state of Missouri as his lawful attorney and agent upon whom may be served all process in suits pertaining to such actions and proceedings;
(3) An agreement by such nonresident that any process in any suit so served shall be of the same legal force and validity as if personally served in this state.

§ 506.210, RSMo

L. 1941 p. 435 § 1, A.L. 1955 p. 310