In New Ulm, a group of at least 6,000 attends a rally at Turner Park to protest the policy of sending draftees of German descent to fight in World War I.

A Baptist church in St. Paul holds Minnesota's first known Sunday school session.

Princeton-area farmer O. J. Odegard is the first to utilize the labor of Axis prisoners of war when he requests 100 Italian POWs for farm work due to the acute labor shortage in Mille Lacs County. Odegard is forced to pay the average wage for farm work, $3.00 per prisoner per day, and the prisoners and forty armed guards arrive from Camp Clark, Missouri, on September 5. Provided with kitchen facilities, the prisoners prepare their own food, and, in fact, they are such skilled cooks that their guards prefer their meals over standard army fare.

St. Paul's horse-drawn fire engines make their final run.

The Sisseton and Wapheton Dakota sign the Treaty of Traverse des Sioux, near St. Peter. Maḣpiya Wic̣aṡṭa (Cloud Man) and Iṡtaḣba (Sleepy Eye) are among the Dakota signers, while Alexander Ramsey and Luke Lea represent the United States, with missionary Stephen Riggs interpreting.

Father Francis Pierz, a Slovene priest, arrives at his post in Grand Portage. He remains there for a few months and then returns in 1841 to establish a mission on the Pigeon River. His later writings encourage Germans and Slovenes to immigrate to the "earthly paradise of Minnesota."

Geographer Joseph N. Nicollet is born in France. After traveling by canoe to Omashkoozo-zaaga'igan (later called Lake Itasca) in 1836 and to Inyan Sa K'api, a pipestone quarry sacred to Dakota people, in 1838, he published a map of the upper Mississippi River's drainage system in 1843.

Pitcher Ila Borders of the Duluth-Superior Dukes is the first woman to win a men's regular season professional baseball game. The Dukes beat the Sioux Falls Canaries 3-1, in Duluth.

Joseph A. A. Burnquist is born in Dayton, Iowa. Between 1915 and 1921 he would serve as the nineteenth governor of the state and lead the Minnesota Commission of Public Safety. He died in Minneapolis on January 12, 1961.

James J. Hill arrives in St. Paul to work as a shipping clerk for J. W. Bass and Company. He later made his fortune as a railroad baron and business tycoon.