I think it is European union but i am not 100% <span />
About 10 to 14 days depends where in Japan or california
China's isolation by the himalayas prevented modernization and kept the ideas and technologies that were traded in europe and india out of there country. this also kept merchants and traders with goods that china could not access out of the country, however, this did decrease the chance of invasion because the mountains did provide protection. the chineese built the Great Wall completely isolating themselves and protecting there pure chinese cultures and traditions and they remained uneffected by the rest of europe.
