The mongols invaded china with the intentions of having china under the Mongol Yuan rule.
The geography of the Korea kept it isolated from other nations. A mountain chain seals it off from China. The Sea of Japan is a treacherous body of water that separates it from Japan. Korea has been called the "Hermit Kingdom". In spite of this however, Korea has been conquered by other nations; China, Japan, the Mongols. Buddhism and Confucianism entered Korea from China.
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It was the "Printing Press" that was developed by Johannes Gutenberg in 1454 and enabled ideas to spread quickly, since before this, almost all books had to be transcribed by hand, which made them relatively rare and expensive.
An earlier quota system based on national origin and established a new immigration policy based on reuniting immigrant families and attracting skilled labor to the United States
