Why was navigation (the ability to "navigate" the seas) so important to China's development?

china has confucianism thats everywhere in asia but it isn't really a religion.  

"a shortage of traditional labor created new opportunities in the workplace. a major cause of the internment of japanese americans during world war ii was. racial prejudice. in the early 1940's, the "destroyers-for-military-bases deal" with great britain and the lend-lease act were evidence that the united states."

it is based on the same philosophy as health insurance

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