But generally the warlords are powerful only to the extent the underlying nation is engaging in extensive co-operation and wealth creation out of their free will. Nations are truly created by those ordinary people.
I am reminded of a powerful Indian tyrant named Muhammad Bin Tughlaq. He for some reason decided to move his capital to a different geographical area. By moving he literally wanted to move everything including the people to this new geographical area. Not only he failed miserably his name Tughlaq is synonymous with "idiotic behaviour high on power".
As regards its remote effects, the Deccan experiment of Muhammad Tughluq was a remarkable success. The boundaries which had separated the North from the South broke down. It is true that the extension of the administrative power of the Delhi Sultanate into the Deccan failed, but so far as the extension of the cultural institutions was concerned, it was successful."
However, a couple things about those citations
1 - to the best of my knowledge the musket wars predominately were inter-tribal warfare b/w Maori. Basically Europeans gave them muskets and they turned them on each other.
2 - the NZ Wars actually occurred after the signing of the Treaty of Waitangi, which occurred in 1840, and is the same year when NZ was claimed as a sovereign country.