Hard to tell from your original photos, but are the leaves opposite or alternate? The leaf scars look like they are opposite, but I can't tell. If they are opposite, it is not poison sumac. Also, the leaf stems of poison sumac are red. Hard to tell from your photos, but are they red? Poison sumac have 7 to 13 leaflets. Hard to tell from your photos, but not sure it fits. My first guess was white ash. If the leaves are opposite, I am pretty sure it is white ash.