Centuriesbeforetheworld'soceansbecameaglobaltradehighway,Chineseseafarerssetsailtofarawaylandstoexchangecommodities.Now,HistorianSamWillisretracesthegoldeneraofmaritimetradetouncoveralegacythatculminatedinoneofthegreatestarmadasofalltime,anddiscoverparallelsbetweentheworldthenandnow.
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