I'm guessing that is an American elm. Some trees survive if they are isolated. Slippery elm has leaves fuzzy on both sides and are larger than Amer elm leaves (it's possible a slippery elm, but they're not usually of that size), Amer elm fuzzy just on the top. There's an Amer elm just north of me in PA, isolated in a cornfield. Not all Amer elms have the classic vase-form.

Thank you Ben! The elms are planted alongside other trees (black walnut and such) in a row lining the corn fields. It seems to me the trees were planted sometime during the origin of the homestead (early 1900s), or during the mid-1900s. The foilage appears healthy, although some leaves present holes, indication of what I believe could be insects. The mayflies are beginning to become more prominent as the months go on.

My brother has some young Amer elms on his PA lot. The fluted base is not unusual for them.

I wonder if seed depth have any correlation with the shape or form of the base of some trees. More likely, it is just the growing habit, however.

I went back today and found an additional 2-3 elms growing farther down along the field line. Every tree is of akin size to the ones in the photos. All are healthy. Might be more on the adjacence of the far side of said field.

Jalisco, for encouragement, the Amer elm isn't going to go extinct, as often diseases/critters such as Dutch elm disease start out on a rampage, then their effect over time becomes reduced somewhat. I would hazard a guess that the same thing will happen over time w/the Emerald ash borer and hemlock woolly adelgid, tho the number of affected trees will have been reduced greatly.