As a diplomat to the United States, Piomingo tended to favor an alliance with the new country as opposed to doing so with the Spanish—who at the time were actively courting the Chickasaw tribes to ally with them.
[7][8][e] Piomingo and Mingo-houma[f] represented the Chickasaw in November 1783, signing a treaty that gave up a large parcel of land at the juncture of Illinois, Kentucky, and Tennessee in exchange for U.S. help to evict a squatting tribe of Delaware Indians below Muscle Shoals that then would be set aside for the federal government's use, at a price.
[3] Piomingo strove to become closer to the expanding United States and its technological advances, sometimes to the detriment of relationships with other Chickasaw chiefs and allied Native American tribes such as the Choctaw and Cherokee.
Creek leader, Alexander McGillivray, who with Spanish help was trying to build a pan-Indian confederation to confront America, thought him a traitor to all Native Americans.
[5][9] Piominko, who became head war chief of the Chickasaw while at the signing when news of Red King's death reached him, never wavered from his decision to align his tribe to the U.S., even though the Federal government didn’t always live up to its side of the deal.
[4][8] In a letter to President Washington dated October 30, 1789, Piomingo implores the government to help re-supply his tribe with bullets and gun powder to help him prepare for possible hostilities as escalating tensions with the Creek[i] caused him concern with expected military confrontations following the next Spring thaw.