Zheng He contributed to the prosperity of China under the Ming dynasty by

Zheng He led China to become the superpower of the Indian Ocean, considered to be “the world's most important crossroads of trade”, in the 15th century.

Explanation:

most are appointed by the president and confirmed by a vote in the senate. however, appeals court judges appoint federal bankruptcy judges, and district judges appoint federal magistrate judges. the qualifications for these positions vary depending on the preferences of the person reviewing nominees.

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