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.
The statement that is true in the Pacific theater during World War II is that the Navajo Indians in the U.S. Marine Corps developed an unbreakable code using their native language.
