Minnesota (and some neighboring states) was largely settled by immigrants from the Scandinavian countries and Germany. Minnesota became a state before the Civil War, before Marx had written the Communist Manifesto and Das Kapital. The historical timeline doesn't really mesh with the idea that the immigrants were predisposed to socialism.
Now of course there were socialistic or "progressive" ideas floating around the US from the Theodore Roosevelt era onward, but that would have probably affected later generations, after most of the earlier immigrants had passed on.
You are not familiar with the history of Minnesota’s radical politics.
There were socialists before Marx. Abolitionists were also frequently utopian dreamers. There was a spate of socialist upheaval in Europe around 1848. Many of those radicals ended up in the USA. The unmoderated Progressive Movement was more successful in Minnesota than elsewhere, and it became the Minnesota Republican Party. Minnesota’s north has many Italians, Serbs, Finns and Jews.
It’s not a mistake the Minnesota was the home of the American Communist Party, and that it is home to the most successful radical party in the 50 states.
MN statehood: 1859; ‘’The Communist Manifesto’’, wasn’t that 1848?