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History is the study of the past, not a particular race. Claiming that "white" civilization is more important than others is blatant Eurocentrism. Claiming that miscegenation caused their downfall is grossly overlooking social, political, religious, and historically contextual factors.
During the Middle Ages, Medieval Europe did almost nothing to further human development. It was the Islamic empires and East Asian civilizations that housed most human progress.
There have been many more non-white civilisations than white civilisations. Its just human nature that civilisations white or non-white rise and fall
Greek Civilization was White run by White people. Egypt was ruled by White people with the Nubian and Semitic races as a minority under rule - this continued until miscegeneration became the norm in both cultures.
Viewed another way, history is the story of one privileged race with better access to resources ambushing every other race with war, raping and enslaving everyone in their path, and viewing themselves as genetically superior based purely on arrogance.