Cosmopolitanism is grounded in the international idealism of Immanuel Kant. Proponents of cosmopolitanism argue that wars are caused by the existence of independent nation-states. In order to achieve peace, the nations of the world should unite under an international order and reject the use of war as a tool of foreign policy. Under this scheme, conflicts would be mediated and if necessary armed intervention could by taken by the governing international body (such as the UN) against rogue nations.
The links below will take you to various databases available to use as an RTS student. Use these databases to find books, articles, essays and other resources you can use for your research. If you need help using a database, contact your librarian.
The RTS libraries do not collect much material on cosmopolitanism. The resources in this book are available through ILL. Other resources can be found at www.worldcat.org
Cosmopolitanism by 
The Cosmopolitanism Reader by 
Cosmopolitan War by