[Buxato]

So if we conquer a place and change the people there, it's the new people who decides? or how we proceed?

[iso1631]

After 500 days? No

After 500 years? Yes

Somewhere between is reasonable to debate, but many people won't even agree on the principal of self determination, at least not consistently. Personally I wouldn't put the threshold longer than a human lifetime

[yorwba]

It has always been thus. If you don't like the outcome of a war of conquest, you'll most likely have to start another war of conquest to try and get a different outcome.