The yellow river (huang he river) is sometimes referred to as "china's sorrow." what would be the best explanation for this sad nickname?

They also call it the China Sorrow because it used to flood and reek devastation.

Hope this Helps! :) 

Cherokee  removal, part of the trail of tears, refers to the  forced  relocation between 1836 and 1839 of thecherokee  nation from  their lands ingeorgia, south carolina, north carolina, tennessee, texas, and alabama to the indian territory (present day oklahoma)  in  the thenwestern united states, and the resultant deaths

Amuslim warrior especially : one victorious in battle against the opponents of islam —often used as a title of honor.