(PS, you just broke 2 TFOD rules... You need to get one right to post, AND you need to take the pic yourself... I think! ...So do you have a guess as to what mine is?
To double check my guess, I looked it up and found the image online. I assumed that you didn't take it... Sorry about that! You only broke 1 rule then! ;-)
It's not L. styraciflua. In fact, Sweetgum is way late compared to this tree, which is ahead of U. americana in the pic. Look at the top leaves, you'll get it.