Read this: Treaties formed an important part of European colonization and, in many parts of the world, Europeans attempted to legitimize their sovereignty by signing treaties with indigenous peoples. In most cases these treaties were in extremely disadvantageous terms to the native people, who often did not appreciate the implications of what they were signing.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): What did Europeans try to legitimize all over the world by signing treaties with indigenous people?
their sovereignty