Ignoring the massive cost, legal hurdles, and the opinion of the residents/government/outside powers, if you could magically grant independence to certain territories or form new bigger nations from existing ones with no repercussions to yourself, what new countries would you create?
Please treat this as a non-serious post, let’s not get into a massive political debate, those never end well.
Any country larger than ~100k km^2 - simply because even at that side there are vast cultural and economic differences that require different governing styles, and have different attitudes to certain topics.
With smaller countries come smaller, more localised decision making that benefits the most people of the region, and thanks to being small, it puts emphasis on these smaller states working together instead of being antagonists of their neighbours.
Oh and it also solves the issue of a small percentage of the population electing a complete buffoon with unfettered access to nuclear launch codes.
Hell, bring that 100k down to 20k and it’s still a manageable system that better represents 80+% of the population than a large government of a large country.
Good luck having countries in what was Australia with barely anyone because they’re in the middle of the outback