Ответить на вопрос. What kind of state dominates the political geography of the world nowadays? Are all the existing states stable? Provide examples of stable / unstable states

Today, such a political structure as a Federation is common. To date, it is difficult to assess the stability of the state, since not all of them are stable. For example, Federal States in Europe and America are considered very successful. And the States of Africa and Asia, find stones on their way.