The Mongols actually conquered much of the lands that Muslims conquered and Alexander the Great earlier conquered. The Mongols and Alex left but the Muslims are still there on lands they conquered with the sword and forced the indigenous people to convert to Islam or be killed.
The mongols including Genghis Khan himself impregnated many women along the way going westbound. Today in Indian and Pakistan, his descendants still bear his name as there are many with the surname Khan in both countries. Genghis Khan started many dynasties.

