The Law of the Earth guarantees every person the Right to Freedom of Movement: to be anywhere on Earth, at any time, for any amount of time, as long as their conduct is peaceful. Human rights apply to every person on the planet, whatever their nationality.
Borders are lines that people drew around land they never owned. (But laws come from nations and governments!) No one created the land, so no one can own it, and no group can claim the authority to keep a peaceful person off it.
That doesn't leave a community defenseless. Anyone who commits or threatens real harm forfeits sovereignty in proportion to that harm, wherever they were born. (Legitimate Force.) The line the Law draws is between the peaceful and the harmful, not between the native and the foreign.
Settling in a place also comes with a voice in it. In the Law, voting power on land use grows with the time a person has lived nearby. (Title 3.)