Canada

This is a lazy and simplistic worldview. Every single square mile of land has been colonized, conquered, re-conquered, and conquered again. In other words, every culture has been both colonizer and colonized. Human migration has been occurring since time immemorial, and human migration generally means displacing whomever was there before. It is often a chain reaction, where one migration causes another, causes another, ad infinitum throigh history. In the most dramatic situations we sometimes label it genocide, but usually it's more of a slow blending of cultures (and genes) over time.