The Creeks, with M'Gillivray at their head, had also established a close alliance with the Spaniards, who held possession of Florida. The Spanish governor of that province courted the young half-blood chief, and he was honored with a colonelcy in the military service of Spain. Through the Spaniards, the Creeks could readily obtain arms and ammunition in exchange for their furs; and thus, in point of strength, they were the most formidable enemies to the United States among the Indian nations.
Good policy caused the United States government to send commissioners to treat with the Creeks; and in the autumn of 1789, General Lincoln, Colonel Humphries, and David Griffin--a commission appointed by Washington--met deputies of that confederacy on the Oconee, to hold a treaty. M'Gillivray was at the head of the deputation. He received the American commissioners kindly, and expressed a desire for friendship; but when he found that they did not propose to restore to the Creeks their lands about which they had disputed with the Georgians, he abruptly ended the conference, promising, however, to remain peaceable until further negotiations could be had.
In March, 1790, Washington despatched Colonel Marinus Willett on a new mission to the Creeks. He succeeded in persuading M'Gillivray to go to New York, to carry on negotiations there. Attended by twenty-eight sachems, chiefs, and warriors, he arrived at the federal capital on the twenty-third of June, having been received with much attention at the principal towns on the line of his journey. The members of the Tammany society of New York, arrayed in Indian costume, escorted M'Gillivray and his party into the city; and the Creek chief, being the son of a Scotchman, was made an honorary member of the St. Andrew's society.
These attentions, and the gracious manner in which he was received by the president, made a deep impression on M'Gillivray's mind. General Knox, the secretary of war, was appointed to negotiate with him. A satisfactory treaty, founded upon mutual concessions, was made; and one of the last acts of Washington during the second session of the first Congress was the approval of that treaty. It was signed by the contracting parties on the seventh of August, and was ratified on the thirteenth, the day after Congress adjourned.