Two different states of a democratic country, X and Y, follow different cultures, speak different languages, and are home to different ethnic groups. However, a recent dispute over the a common resource has led to severe conflict between the states and the union. Leaders of X are unhappy with the central government's response, because they believe state Y does not deserve any part of the resource. Leaders of X want to break away from the country so that they can have total autonomy over their own area.
Which of the following terms is most relevant to the situation described above?