I found this walking an old farmstead, I have a feeling this tire and many others in the area were dumped in the 40's and have been and will be forgotten by most.
I have been helping my father rid the place of these and other such stuff that should be removed. I am not sure why things like this were dumped and just left to rot, which history shows us does not work to well.
Very interesting, that tree just happened to come up in the middle of that tire all those years ago. Its a shame that some people, even that many years ago had so little respect for the outdoors and natural areas like this.