Definitely NOT Sumac. Sumac is more like a bush than a tree and makes an umbrella style canopy at about ten feet tall and has red fuzzy clustered seed bunches. The Natives used Sumac seeds to make a drink from.
It's a stumper for sure. I may say it looks like Kentucky Coffeetree. Redbud is another similar. Would be easy to determine if you had the leaf.
Not hackberry unless the ones in IA are different. The hackberry in IA have smaller raised pieces, "warts", on the bark. Seeds are brownish/purpleish balls that hang from a stem. No pods.