What made native american peoples vulnerable to conquest by european adventurers?

The Native Americans were not aware of how selling/buying worked or the concept of land-owning.

The correct answer is c

The question of what caused the full effects of the radical stage, also called the second french revolution by some historians, which shook the political and social reforms in france have caught the attention of many scholars, particularly because of principles implemented during this stage which is contradictory to the fundamental principle of the french revolution itself, by using dictatorship to create equality.