<P> The Missouri Constitution is the state constitution of the U.S. State of Missouri . It is the supreme law formulating the law and government of Missouri, subject only to the federal Constitution, and the people . The fourth and current Missouri Constitution was adopted in 1945 . It provides for three branches of government: legislative (the Missouri General Assembly), executive (the Governor of Missouri), and judicial (the Supreme Court of Missouri). It also sets up local governments in the form of counties and cities . </P> <P> The first constitution was written in 1820 in only 38 days . The Missouri Constitutional Convention (1861 - 63) was elected to decide on secession, and made no changes to the constitution . </P> <P> In 1865, after the American Civil War, and again in 1875, after reconstruction, new constitutional conventions composed Missouri's second and third constitutions . In the early 1900s, the Constitution of 1875 was amended to allow constitutional amendment by the initiative process . </P>

When was the first missouri state constitution written