After World War I, in which he served as a first lieutenant, he settled in Buffalo, New York, where he worked odd jobs.

[1] At a time when federal Indian policy emphasized assimilation, Mount Pleasant was sent as a child to be educated at Native American boarding schools.

[3] The 1907 Carlisle Indians team, coached by Pop Warner went 10–1 with a 26–6 victory over the perennial powerhouse, Harvard.

[1] Mount Pleasant, under Coach Pop Warner, was arguably the first to throw the spiral pass.

[1] After the Olympics, Mount Pleasant completed his studies at Dickinson College, becoming its first Native American graduate.

[5] Mount Pleasant moved to the University of Buffalo in 1915, where he coached the football team to a 3–4 season.

Initial reports indicated that Mount Pleasant sustained a fractured skull, "possibly by violence.

"[7] But the next day, Francis M. Kujawa, the Buffalo medical examiner, ruled the death as the result of an accidental fall.