Revolution
The Etsuman gather under the "single banner" of one emperor to oust their colonial overlords.
The occupation of Etsuman was not long lived, eventually quashed by an uprising. Clanmasters gathered their strengths and allied under the rule of a single emperor, in an attempt to dethrone their colonisers. Some humans remained to live under the Emperor or under various Clanmasters, and there is relatively little bad blood between Tabaxi and Amn Humans in the modern day.