Ca. 1977-8, Cadillac Bar, Houston. It was a new, hot Mexican place, taking it’s name from a famous place either in Mexico City or Nuevo Laredo, I forget which. We were having a staff party and an Hispanic staff member, who liked to point out his ancestry was Spanish, not Mexican, ordered cabrito and shared a bite or two with those who were interested.
Within a few years, the Pappas family started opening their Pappasito’s Cantina’s all over town and cabrito was a big hit on the menu.
Today it’s widely available both because of a big Hispanic presence and also a big Muslim population. There’s a little Pakistani place near me that does a pretty good Goat Keema. I can get packaged goat at a major supermarket near me and there are many more Halal butchers than there are Kosher and they all will have some goat, very commonly whole leg but also whole head.
Many tortillerias offer birria as a weekend special, though it tends to be only so-so. The very best birria stand in town was just a mile from me but lost it’s building due to a new Aldi going in. He was so popular I’m sure he’ll pop up somewhere else but I haven’t found him yet.
Oh and there is the World Goat Cookoff in Brady, TX, every year.