What does Mearsheimer say about states being the most important actors in world politics?

John Mearsheimer, a prominent political scientist and international relations scholar, argues that states are the most important actors in world politics. This view is central to the theory of realism, of which Mearsheimer is a leading proponent.

1. Mearsheimer's Argument: Mearsheimer argues that states are the most important actors in world politics because they are the primary entities that possess the power, resources, and autonomy to shape international relations. He asserts that states, not international organizations or non-state actors, are the ones that ultimately make decisions about war and peace, trade and economic policy, and other key aspects of international relations.

2. Anarchy and the Self-Help System: Mearsheimer's view is grounded in the concept of anarchy in the international system. He believes that there is no overarching authority above states, and therefore, states must rely on themselves (a self-help system) to secure their interests. This leads to competition among states, making them the primary drivers of international politics.

3. Power and Survival: Mearsheimer also emphasizes the importance of power in international relations. He argues that states are primarily concerned with their survival and that they seek to maximize their power to ensure their security. This focus on power further underscores the central role of states in world politics.

4. Critique of Liberalism and Constructivism: Mearsheimer critiques other theories like liberalism and constructivism that place significant emphasis on international institutions and norms, or the role of ideas and identities in world politics. He argues that these factors are secondary to the power and interests of states.

5. Offensive Realism: Mearsheimer's theory of 'offensive realism' further highlights the importance of states. He suggests that states are not just defensive actors seeking to maintain their security, but are also offensive actors seeking to maximize their power at the expense of other states.

In conclusion, Mearsheimer's view is that states, due to their power and the anarchic nature of the international system, are the most important actors in world politics.