Rights (as they exist today) are based in legislation. Legislation is fundamentally political. Politics is glorified tribalism.

While the people who formulate and enforce our rights are put there by geographic tribes, you won't see rights that stretch far beyond your borders. It's only when a community that is no longer geographic in nature forms tribes that we see the geographic tribes pay attention to the rights of "foreigners", and not because they're foreign, but because they're important to their own voters.