the missouri constitution is the state constitution of the state of missouri in the united states. it is the highest law which forms the laws and government of missouri. it is subject only to the united states constitution, and the people of missouri. the fourth and current missouri constitution was adopted in 1945. it provides for three branches of government. the legislative branch is the missouri general assembly). the executive branch is headed by the governor of missouri. the judicial branch is the supreme court of missouri and the missouri state courts. it also sets up local governments in the form of counties and cities.