I’ll disagree with the poster you’re responding to and admit that indeed, the states are not so culturally and geographically different that they need to be independent: surely, a rural hamlet in France is as different from Paris as any two parts of the US are.

But there are good reasons other than those to hope the states evolve towards more autonomy. The US political system at the federal level is fundamentally broken, making it incapable of governing the country. Due to a combination of factors: first-past-the-post voting, skewed representation in the senate, media polarization, the filibuster, and others, it is unique among supposed democracies in allowing small minority factions to effectively veto any mildly controversial legislation.

Because meaningfully modifying the constitution is functionally impossible, these issues simply can’t be fixed. But luckily, that isn’t true at the state level! Most states still are functioning, if imperfect, democracies, as evidenced by the very thing we’re discussing in this thread: they’re capable of changing policy in response to changing needs and wishes of the population, in a way that the federal level simply isn’t.