Because of the stong Zoroastrian states to the west of China, the Chinese expanded not into Central Asia and Tibet but into Mongolia and Northern Asia. Wars with Russia sapped China's strength and led to the independence of Beijiang. Despite China's power, European powers came to dominate China. The Manchurian Qing dynasty was subjected to a rebellion and fell to the New-Sung Dynasty.
Today, while China's borders are perhaps much reduced compared to what might have been, its internal power structure is relatively strong, with a strong backing from Buddhist authority. China's ancient culture and ideals reign strong in what the Chinese still call the Middle Kingdom.