Manchoo is a nomad originagted from Manchuria, Northeast China. Manchoo and han don't have too much difference by race. Actually manchoo is not a totally nomad like other nomadic tribe mongolian or kazakh. They are more like half nomadic, half agricultural. Their original name is Jurchen, and jurchen started to blend with other nomadic or agricultural groups like han, mongolian or korean since thousands years ago. They don't live in prairie like mongolian. They live in mountains in Northeast China. These mountains are rich in resources like medicinal materials, wood, pearl or even gold. With these resources, they became a rich and powerful group and finally formed the last feudal dynasty of China. After they formed the Qing dynasty, to avoid the pathetic fate of Yuan dynasty, another dynasty of nomad in China, they almost gave up their nomadic culture and were eager to learn han culture, blended with han people. So nowadays, most manchoo changed to han. About their hairstyle, not only manchoo, almost all the nomad in China have similar habit. This is determined by thier nomadic lifestyle. This kind of hairstyle is convienent for their nomadic lifestyle,just like sakayaki of japanese samurai. After manchoo formed Qing dynasty, to demonstrate the authority of the royal family, the emperor ordered all Chinese men not only han and manchoo, all of minority nationalities even like Hmong, Uygur and other minorities must have the same hairstyle. But for woman, they could keep their traditional dress and hairstyle.