Spread Of Classical Civilizations

After the fall of classical civilizations, we saw a spread of civilizations / cultures influencing other civilizations. For example, in 632 Muhammad, Islamic prophet was born and years later he would began to spread Islamic around the Middle East. Meanwhile in Eastern Asia, Chinese civilizations (Sui, Tang, and Song) would begin to influence other Asian cultures such as Japan, Korea, and Vietnam. Most specifically Korea, during the spread of Chinese during 600-1573 Korea would try to continue Chinese elite culture, like Silla rulers rebuilding their capital at Kumgong on Kyongyu plain to look like Tang counterpart. Also they changed up Chinese culture to fit their own, for example having Buddhism as their main religion rather than Confucianism.