Hamish Reid writes:

A language spoken continuously by indigenous US citizens in the
US and that long predates the use of English in the US is "foreign"?

Yes.

As with Jim M., I'm guessing that for you the phrase "foreign language"
means something like "non-official language", or "non-dominant
language", or "language I don't speak", or "language some foreigners
use", rather than what the phrase might mean to many of the rest of us,
something like "a language not spoken by the indigenous peoples of a
certain area" (to steal a definition from somewhere else)?

A language not spoken by the mainstream.

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