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Alexander Wendt is an American Political Scientist who is one of the main constructivist researchers in the field of International Relations. He wrote an article that states why constructivism is better than Realism and Liberalism.

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Kenneth Waltz's contribution to the political science is founding Neorealism (structural realism).
Neorealism: International Relation which posits that the interaction of sovereign states can be explained by the pressure exerted on them by the anarchic structure of the international system, which limits and constrains their choices.

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Adam Smith is considered to be the founding father of modern Economics. He's also known as the father of Capitalism. He always believed that free and global market is the best way to proceed. His global economy ideology proves that Adam Smith is one of the founders of liberalism.