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C.) It made China the center of trade

Explanation:

The Silk Road being the main reason in support of this argument.

it isolated China from other civilizations

Explanation:

its long mountain ranges prevented other countries from reaching China for many centuries allowing for it to develop on its own

the compromise of 1850 was a package of five separate bills passed by the united states congress in september 1850, which defused a four-year political confrontation between slave and free states on the status of territories acquired during the mexican–american war

porter is writing economic history because he is focusing on the cost of developing vaccines.