I'm not clear on how "No person..." selects some subset of people with whom such government prohibitions apply.
>at the time of the founding it was taken for granted that the Constitution only applied to American soil.
The Constitution makes no mention of geography. Instead it is entirely a collection of MAYs, SHALLs, and SHALL NOTs directed at the government.
>Most of the extra-territorial application of the Constitution...
...is predicated on notions of geographical distinction wholly absent from the Constitution.