Mo. Rev. Stat. § 184.250
In appreciation of the services rendered by the citizen soldiery of Missouri in the war against Germany and her allies and for the purpose of preserving the records and perpetuating the memory of their heroic achievements, a memorial building, monument or other suitable testimonial shall be erected or placed in each of the counties of the state and in cities not part of a county. Such memorial may be a building or a monument or in the form of tablets suitably inscribed and placed in some building at the county seat of such counties or at such places designated by the county commissions of said county and in said cities not part of a county. The exact nature of such memorial shall be determined by the county commission of the county or by the municipal assembly of said city.
§ 184.250, RSMo