1588-1679 1724-1804 1856-1939 boundaries congresses contributionsinpoliticalsciencekant enlightenment ethicskant freud general germany(east) hermann history hobbes humanrights immanuel internationalrelations justice kant literatureandstate metaphysics nationalism naturallaw peace phi013000phi019000pol010000 philosophy pol034000pol011000pol035010 political politicalfreedom politicalscience reason responsibilitytoprotect(internationallaw) security sigmund sources state the theory thomas