On Wednesday afternoon, November 25, 1863, the Second Minnesota Volunteer Infantry Regiment participated in one of the most dramatic assaults of the Civil War. They were fighting the Battle of Missionary Ridge, one of several important battles they had been involved in throughout their two years of service in the Union Army. This battle would prove to be the most significant in the history of the regiment.

In December 1901, botanist Alexander Pierce Anderson created puffed rice while experimenting with starch crystals in his laboratory. Although he did not yet realize the significance of his discovery, Anderson's new breakfast food would make him a nationally known figure and the face of a Quaker Oats advertising campaign for almost a decade.

In 1898, four hundred members of the Fifteenth Minnesota Volunteer Infantry were hospitalized with typhoid after camping at the Minnesota State Fairgrounds. U.S. Army surgeons decided the epidemic's source was the public water of Minneapolis.

In 1871 Minneapolis built the first public waterworks in Minnesota to pump water from the Mississippi River. The city's attempts to provide clean, safe water led to decades of efforts to improve and expand the waterworks.

Mennonites arrived at Mountain Lake in 1873. Mennonites are a Protestant Christian group with sixteenth century European origins. Their name refers to Menno Simons, who was a Dutch religious reformer. Simons preached a fundamentalist, more literal interpretation of the Bible. He also emphasized the importance of adult baptism. Along with these beliefs, Simons promoted a simple way of life similar to Jesus Christ and the apostles. As part of his creed, he stressed the importance of Christian brotherhood, pacifism, and the primacy of family in Christian life. The tenet of pacifism played a significant role throughout Mennonite history.

The Treaty of Traverse des Sioux (1851) between the Sisseton and Wahpeton bands of Dakota and the US government transferred ownership of much of southeastern Minnesota Territory to the United States. Along with the Treaty of Mendota, signed that same year, it opened twenty-four million acres of land to settler-colonists. For the Dakota, these treaties marked another step in a process that increasingly marginalized them and dismissed them from the land that had been—and remains—their home.