Final answer:
The condition not leading to the Plains Indian Ghost Dance was the belief that the ghost dancer's white shirt could stop bullets. This idea was an addition by Sitting Bull and not part of the original Ghost Dance prophecy by Wovoka.
Step-by-step explanation:
One condition that was not leading to the Plains Indian Ghost Dance was the notion that the ghost dancer's white shirt would stop white bullets. Instead, the Ghost Dance movement was initially a peaceful form of resistance against the attempts at assimilation by Easterners, combined with a spiritual belief that the dance would lead to the earth consuming all whites, the return of the buffalo and Indian lands, and the revival of the deceased ancestors of the Native American tribes.
It stemmed from a prophecy by Wovoka, a Paiute spiritual leader, who claimed a revelation urging Native Americans to return to their traditional ways and to dance as a form of religious ceremony. The claim that ghost dancer's white shirts would stop bullets was actually added by Sioux leader Sitting Bull, which the U.S. Army interpreted as an ominous sign of impending warfare, eventually leading to tragic consequences at Wounded Knee.