Why did Genghis Khan feel the need to fragment the Mongol tribes into new social and military groupings?

The following reasons forced Genghis Khan to fragment the Mongol tribes into new social and military groupings:

• Mongols were the inhabitants of the steppe region. They had their own separate identities. So in order to bring them in touch with other tribes, Genghis Khan took this step.
• Mongols were courageous people. Because of this nature, Genghis Khan organized them into military groups and established a formidable army. A sound military organization could be very helpful in trade also .
• Childhood experiences of Genghis Khan were also responsible for the fragmentation of Mongol tribes. Genghis Khan himself had to suffer a lot during his childhood.