Broadly speaking, any philosophy that rests on an oldest-claims-first metric are guaranteed to cause violence.
Information degrades the further we go back; you’re prioritising the wishy-washiest sources of truth. And the nature of human migration and interbreeding means the further you go back, the less likely you are to find genetic ancestors of the people who currently control the land. The people alive on the land you want them off. People with guns.
(The theory is also fundamentally based on the notion that racial migration is wrong. Immigrants to America have less claim than white Americans, who have less claim than natives, except for all the natives who were conquered each other because they moved around too.)