My ID app says wild serviceberry, Amelanchier Arborea. Make sense anyone?
Amelanchier is native to Minnesota, the OPs home state. Leaves are apple-like, but different enough. Bark is usually a give away. Amelanchier have smooth bark, much like beech or hornbeam, just a touch of brown in the shade of gray. So the bark looks brown when wet, gray when dry.
Amelanchier are a tree that should be used more for bonsai. The leaves reduce well. They flower before leaves like plum or culinary apricot. They flower a good 2 weeks before flowering crab. They are incredibly winter hardy. Even in Minnesota, you do not need temperature protection, if the roots were not disturb after the end of July. Your first year after collection you might want to protect it. Amelanchier are zone 4 or zone 3 hardy. Flowers are usually snow white, maybe always white. I don't recall any other color. Fruit is small, and pleasant to eat.
Only flaw, they are small trees or tall shrubs, it is difficult to get trunks over 2 inches diameter. (5 cm diameter). Best for medium to small bonsai.