This system is like a last resort of a cornered but honorable people: conquest a sparcely populated area, organize a vote that includes the locals to determine if it is righteous to set up a new nation there (using Constitutional Laws for a new nation, which means it takes quite some time to process the protocol, years).

Example: All out chaos broke out, millions of people had to flee east ... we had to live somewhere and though we didn't like to take other people's land, we couldn't sit under a rock and die either could we. So we engaged in taking territory, but tried to rebuild a nation without throwing the previous inhabitants out; although we did take control of the land ...

Example 2: an opressed nation in a larger empire asserts its rights through military means, declares independence after due voting to measure support, and prepares to take down Imperial forces who show up on the border.

Link: o-6