Mo. Const. art. VI, § 18(o)

The county constitution framed by the commission shall take effect on the day fixed therein and shall supersede any existing charter, county constitution or government, if approved by the majority of the qualified voters of the county voting thereon. The county constitution shall be submitted by the county constitution commission to the election authority of the county not later than thirty days after the completion of the county constitution and not more than one year from the date of the selection of the county constitution commission by the circuit court. The commission may submit for separate vote any part of the county constitution, or any alternative sections or articles, and the alternative sections or articles receiving the larger affirmative vote shall prevail if a constitution is adopted. [Effective - 08 Dec 1994 , see footnote]