Theoretical and historical framework of modern international relations has largely been started from the treaty of Westphalia. It broke thousands years old tradition of religion based administrative structure. In its earlier phase Westphalia defined secular political idea was confined only within Europe. It has spread throughout the world gradually.
For Jeff Haynes, “since the Treaty of Westphalia in 1648 the history of the development of the global state system has largely been the history of clashing nationalisms, with each national group aiming for its own state and with religio-derived ideologies very much secondary.”[1]