Admiral Zheng He's trip to Mecca was a part of his seventh world exploration voyage. It lasted for three years and in these three years he went to Mecca after which he brought political envoys back to China. The voyage lasted from 1430 to 1433 but it is unknown when precisely did it end.
New trade routes and slavery.
Trade plans got them newer items and unfortunately slavey go them their items.
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Common sense is popular because ppl went to school?