What motivated Genghis Khan to unite all the mongols?
Answers
Unite his people and create the largest empire world has seen. Also he was a descendant of of former Mongol king Ambagai Khaan who was killed by China in a very insulting way. Just like what happened to Christ Ambagai was nailed to a cross and was left there to die. Mongols never forgot this and wanted to take revenge on China. After taking over China there was a time of peace. Ghengis sent his caravans of merchants everywhere trying to score new allies and strenghten his reputation. But a shah of Kwarzamia a powerful empire of middle east beheaded his merchants and ordered confiscation of their goods. Ghengis was mad but tried to resolve the issue by sending representatives who were later all killed. Ghengis destroyed the empire shocking the world. Persia was an ally of Kwarzamia who was harrassing Mongol territories and outposts. Ghengis couldnt tollerate this so set for war. Dividing his army into 3 he lead one, his knight like elite generals one, his 4 sons the other. He took central route, generals north, and sons south. His generals had conquered much of Russia and surrounding nations in the way, and so did other armies. It took a year to reach Persia so they had done allot in the way. Persians were shocked because Mongols came 6 months before they thought. Ofcourse Persia was totally annihalated. From then on Mongols were feared by the whole world. Ghengis's Mongol name is Chinggis, and khan mean king its mongol pronoucuation is khaan. From then on next generation mongol kings easily picked off surrounding nations like Korea, Bulgaria, Poland and etc. Finally the reason why Mongol empire declined was because the land and subjects were too much. Only 1 million Mongols existed at the time of Ghengis, but 100 million subjects. And the land is so immense so you cant really control it without today's communication system.
Hope this helped Mongol history is very interesting!