The Constitution of the State of Minnesota was initially approved by the residents of Minnesota Territory in a special election held on October 13, 1857, and was ratified by the United States Senate on May 11, 1858, marking the admittance of Minnesota to the Union. Nearly 120 amendments have been approved (often multiple items at once), with perhaps the most significant being a reorganization in 1974 to simplify the document, making it easier for modern readers to comprehend and reducing the extensive verbiage. It is believed that the constitution was even amended twice prior to ratification.
An election in Minnesota Territory to select Republican and Democratic delegates to a state constitutional convention was held on June 1, 1857, following passage of an enabling act by the U.S. Congress on February 26 of that year ("The Enabling Act for a State of Minnesota"). The convention was held in Saint Paul from July 13 to August 29. However, the divisions between the two political parties were so great that they each held their own separate conventions and never met together aside from five people from each party who met in a conference committee to create a document acceptable to both sides. Still, the tension was so extreme that delegates would not sign anything that had previously been signed by a member of the complementary convention.
In the end, each convention signed their own copies of the document. The two were essentially identical, but had about 300 differences in punctuation, grammar, and wording because of errors in transcription produced as copyists worked late into the night on August 28. The Republican version, written on white paper, ran 39 pages and was signed by 53 delegates, while the Democratic version, written on blue-tinged paper, was 37 pages long and had 51 signatures.