The various Indo-European civilizations were all world-colonizing, whether in a military sense or in a cultural one. Taken together they eventually brought our entire planet under their dominion, with the two most vast colonial structures being the Persian Empire and British Empire. The former was the largest Indo-European superpower in terms of population (including nearly half of Earth's denizens at its zenith), and the latter was the most extensive realm in geographical terms. Buddhism's conquest of East Asia, from its cradle in Northern India, can be seen as a purely Aryan conquest, one which, as we will see was primarily carried out by Iranian missionaries traveling the Silk Route. The Indo-Europeans originated nearly all of the exact sciences and technological innovations based on them, the rich artistic and literary traditions of Europe, Persia and India, as well as major philosophical schools of thought and religious traditions such as Platonic and Germanic Idealism, Enlightenment Progressivism, Zoroastrianism, Hinduism and Buddhism. This heritage is exclusionary, as Carl Schmitt rightly understood the constitution of all properly political states to be. It is, however, by far the most broadly encompassing basis for the emergence of a world state from out of the world war of civilizations and in the face of the technological apocalypse.
Jason Reza Jorjani, “World State of Emergency.”