Final answer:
The event that triggered Indigenous claims to Kanienkehaka sovereignty was the refusal of the victorious Americans to acknowledge Native American land claims after the Revolutionary War. Mohawk leader Joseph Brant formed an alliance that resisted American intrusion into the Northwest territory.
Step-by-step explanation:
The event that triggered and energized Indigenous claims to Kanienkehaka sovereignty was the victorious Americans' refusal to acknowledge Native American claims to their land after the Revolutionary War. In response to this, Mohawk leader Joseph Brant helped form the Western Confederacy, an alliance of native peoples that resisted American intrusion into the Northwest territory. The Northwest Indian War ended with the defeat of the Natives and their claims.