Around thousands of years ago, a group of people migrated to India from what is modern-day Central Asia. They formed their own culture and languages in India. They displaced the erstwhile local people who were in small numbers. From their own, the caste system was started in India as well as the Vedas were written. Simultaneously, the Aryan people migrated in every direction. They traveled east towards China, Burma, Vietnam and other countries. They displaced the indigenous people their. But sometimes, Aryans were married off in local communities. When they traveled south, they reached Sri Lanka, Tamil Nadu, Maldives etc. and increased their population their. They traveled West and reached Iran. From their, a new race of Aryans were formed known as Indo-Iranians. These Indo-Iranians further went south till they reached Egypt and other Saharan Countries. But as they tried to move southwards in interior Africa, they met with fierce climatic changes and the Neanderthal people. The eastern Aryans reached the American continents after the invention of boats. The Indo-Iranians further moved North, North-West and East. They inhabited the European countries (Note- All the Aryans were of same color at first). Most Aryans moved further west to present day France, U.K etc. but some moved further towards Romania, Bulgaria, Ukraine. This migration happened around Paleolithic and Neolithic era. But many thousand years after that came the invading force of the Vikings (They were the predecessors of some rebellious Aryans). They invaded the present day European countries and formed a kingdom. They moved everywhere throughout the European continents. They moved to eastern Europe and then Nordic Aryans married the Indo-European Aryans. Now most of the people in Europe were "WHITE" and "CHRISTIANS". The Vikings further moved towards Russia. Later on, all the Vikings got separated into many big kingdoms like Britain, Austria-Hungary, Prussia, Russia etc. The color and race of people throughout the world might have changed but all the major languages of the world will find their origins in the Aryan language of Vedic Sanskrit.
SO you might wonder that a white person in Europe might be your cousin......