It may be Robinia hispida.

I doubt R. hispida in zone 3, and I see no evidence of the brownish hairs on the young twigs in these photos. I'd suggest Robinia pseudoacacia since at least some of the thorns are paired.

Looks like Robinia pseudoacacia to me too. Where I grew up in Ohio it was an early succession tree in old fields and vacant lots; grows fast and doesn't live too long compared to, say, maples or oaks. On the plus side it has flowers in the spring that look like white wisteria and smell great; I've never understood why people didn't plant it just for the flowers.

Black Locust...another early succession species that is filling the void left after removal of all your oak trees. This one is native to the Appalachians and tends to form large clonal colonies. Large tree with fragrant white flowers.

Thanks everyone. Looks like it is considered an invasive species here in Mn. I will be taking corrective action.