As I understand it, one of Cyrus McCormick's ancestors lived on St. James Farm in Winfield, Illinois (a far west suburb of Chicago). His family had made a wonderful equestrian center there on about 600 acres. The family sold it to the DuPage County Forrest Preserve and is open to the public. The have a part of the entrance to the William Deering and Company on the farm. Here is a website about the farm:
https://www.illinoistimes.com/springfield/the-farm-that-mccormicks-reaper-built/Content?oid=11447581