It appears that Jesse James went to Northfield Minnesota because a Civil War general who became a prominent Reconstruction politician favoring Black suffrage (in Alabama, I think,) was rumored to be a major depositor in the bank they tried to rob. That's racist politics.
Cited in James McPherson's highly approving review of a Jesse James biography that examined the politics of the James mythology. James McPherson is the current preeminent authority on the Civil War, so his opinion is quite reliable. If you're really interested, you can ask for details and I'll dig the book out the attic.