The canal zone was US territory until the Peanut gave it away.
I believe I may have misunderstood your post. I thought you were talking about U.S. installations in any part of the world.
Certainly, those military installations in the Canal Zone were on U.S. land with the exception of an airbase past Santa Clara. We no longer needed it after WWII. But then, “families” did not live there.
The problem seems to be headed for the Supreme Court should McNut become the Republican designee. In the past, those born outside the boundaries of the U.S. and ran for president never made it to the finals. Therefore, there has never been need of a Supreme Court ruling.
Sorry for any confusion on my part.