Which of the following statements is not correct?

Every nation-state has a national government.

The power of national governments today is strictly limited by international organizations

like the League of Nations.

Almost all land on earth has been divided into nation-states.

All of these statements are correct.

The power of national governments today is strictly limited by international organizations like the League of Nations.

Explanation:

To begin with, we can affirm that the League of Nations is an organization that no longer exists today, therefore it is impossible for it to intervene in the nations. On the other hand we can say that international organizations usually do not intervene in countries, unless crimes against humanity are proven.

International organizations work to prevent the start of war conflicts, act as arbitrators and advise countries on their activities.

All of these statements are correct.