An example of nihilism is when one reduces or expands context so as to render any statement or action meaningless. It can be done to anything. In this case, you have employed this pathetic and intellectually dishonest form of rhetoric in attempt to claim "no one is native". Rift Valley natives have undoubtedly migrated throughout Africa hundreds of generations ago and really have no claim to country at all. So, what does this "argument" lead to? It leads to "there are no nations". At that point, you have exited geopolitical discussion, increased speed to max, braced yourself and jumped a shark.
If we are to accept that nations exist then your (so called) argument is stupid.