World history has been eurocentric, up to late 20th century. European historians have written histories of nations and cultures far away for hundreds of years. With the colonial period Europeans were sailing to countries on the other side of the globe and writing letters home talking about where they were, what the people and enviroment was like. You just need to look at a world map to see which continent was the dominant one for the last 2000+ years. So as soon as Europeans started looking at other places in the world, everything was based on it's location towards Europe.

One example of eurocentric history is James Mill's (father of J.S. Mill) British history of India where he uses sources from Persia and Turkey to write about the Hindus. Only Mill never visited India even once - he just wrote it from his office in Britain. So now subaltern revisionists are rewriting the history from their own point of view instead of the eurocentric one (like Romila Thapar's "Somanatha").