Usually, to create your own sovereign state, you just need to get it recognized by the rest of the world. To do that you need to prove you have control of what goes on inside its borders.
Usually if a country splits off peacefully, it's likely to get recognized (the latest addition to the list, Montenegro, did this). If you're a breakaway republic, though, you probably need some hefty allies, a lot of time, and eventually a peaceful resolution with your parent (East Timor did this, Abkhazia is trying to).
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