The response that WAS NOT a reason the American Indian Movement (AIM) formed in 1968 is "Unusually high numbers of Native American men had been drafted into the Vietnam War and sent to the front lines."
While the Vietnam War had broad impacts on many communities, the primary motivations for the founding of AIM were focused more on issues like poverty, unemployment, treaty rights, and community empowerment rather than the specific context of military service during the Vietnam War.