This is an elm (judging just by the leaf that is serrated and characteristically asymmetrical).
It could be, say, Ulmus davidiana var. japonica 'Prospector'. Or it might be Ulmus americana 'New Harmony'.
To conclude exactly which elm, you need to do more Sherlock Holmes work.
There is a nice article on identifying elms: How to Identify an Elm Tree. It outlines three approaches to identifying elms.
Identifying Elms with Basic Characteristics
- Examine the leaves of the tree.
- Look at the bark.
- Check for overall height and width.
- Look at the trunk.
- Consider the tree’s location.
Looking More Closely at the Tree
- Identify what creatures the tree attracts.
- Look for visible roots.
- Look for sick trees.
Identifying Seasonal Changes Associated with Elms
- Look for flowers.
- Look at the seeds of the elm.
- Examine elms in the fall.
- Examine the tree in the winter.
Sources mentioned in the article