(William Dieterich) nattered on
le.com:

Could someone please fill me in on this or point me to a site.

I was wondering what the origin of Steak American is and why it is
called what it is.

I have never even heard of such a thing, and I've been American all my 37
years. My mother has never heard of such a thing, and she's been American
her whole life (60 years). This sounds like something that is as
"American" as "German Chocolate Cake" is "German".