You have to understand that Chinese culture is very inward-looking. All the invasions, unless they end up ruling China like Mongolians and Manchurians, are mere

You have to understand that Chinese culture is very inward-looking. All the invasions, unless they end up ruling China like Mongolians and Manchurians, are merely considered external forces not too different from natural disasters. Also, Chinese people don't see China as a single continuous entity like outsiders do, so most of the blame shifting doesn't have to go toward outside sources.