IIRC, all horse slaughterhouses in the US have been outlawed.
Yes, a little known campaign was successfully initiated by Hollywood types to stop the slaughter and/or export of horses to places like Belgium, where people do have a taste for it, along with mayo on fries....
The ban has decimated the industry, simulataneously increasing US wild horse populations to an overpopulated condition causing environmental strain, while countries like Argentina have taken up the slack in exports to Europe.
Happened fairly recently, after 06, IIRC.
All in all, a lose/lose situation for the US, thanks to Hollywood supported Dems.