Eastern Xia was later destroyed by the Mongols
... that though formerly a vassal to the Mongol Empire, Eastern Xia was later destroyed by the Mongols because it rebelled against them?
... that though formerly a vassal to the <a href="./Mongol_Empire" id="mwCM8" rel="mw:WikiLink" title="Mongol Empire">Mongol Empire</a>, <b id="mwCNA"><a href="./Mongol_conquest_of_Eastern_Xia" id="mwCNE" rel="mw:WikiLink" title="Mongol conquest of Eastern Xia">Eastern Xia was later destroyed by the Mongols</a></b> because it rebelled against them?