I would argue that the constitution doesn't even apply to the people, rather citizen or not. The constitution applies to the government, its offices, its officers and its territories(not republics/states).

You and I could create an organization or association and make rules and regulations for said organization or association, then say that these rules and regulations apply to organization or association and its land or property, but those rules and regulations wouldn't apply to the people outside of our organization/association and its property.