Liberalism

Next international relations theory I want to write down here is liberalism.
It analyzes world politics in the opposite way to realism. Although realism views the world pessimistically, liberalism does it optimistically. The essential concept of liberalism is that it regards each nation as the existence which does not fight with other nations, and thus which seeks for establishing a community for the cause of peace. This concept is the representative of Hugo Grotius' theory. He laid the foundations for international law. That is why Glotius is called 'Father of international law.'

I will add much information later^^