Why did this happen?

William McIntosh was a controversial chief of the Lower Creeks in early-nineteenth-century Georgia. His general support of the United States and its efforts to obtain cessions of Creek territory alienated him from many Creeks who opposed white encroachment on Indian land. He supported General Andrew Jackson in the Creek War of 1813-14, also known as the Red Stick War, which was part of the larger War of 1812 (1812-15), and in the First Seminole War (1817-18). His participation in the drafting and signing of the Treaty of Indian Springs of 1825 led to his execution by a contingent of Upper Creeks led by Chief Menawa.

i know number 8 is something about only using 3/5 of the slave votes.