The central government working with the state and local governments in an example of a system of government.

Explanation:

    powers not granted to the Federal government are reserved for States and the people, which are divided between State and local governments.

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the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.

a. competition between france and england for land and power