In the UK I don't need a passport to travel or move home, yet social programs and taxes vary not just between the constituent nations but also between smaller g

In the UK I don't need a passport to travel or move home, yet social programs and taxes vary not just between the constituent nations but also between smaller government areas. It's often decried as a "postcode lottery". I'm certain that it varies even more between American states. Presumably the social "safety net" assistance in California is different to that in Montana. In Alaska people get free money. Entitlement tends to be based on where you live