A single unified country is a double-edged sword. If every part of a country truly had their own laws, it's hard to keep that thing a single country. Federation

A single unified country is a double-edged sword. If every part of a country truly had their own laws, it's hard to keep that thing a single country. Federations are a way to counterbalance that, but if the states were fully independent it wouldn't be a federation anymore by definition right?