Articles of agreement and convention made and concluded on the She-nah-nam, or Medicine Creek, in the Territory of Washington, this twenty-sixth day of December, in the year one thousand eight hundred and fifty-four, by Isaac I. Stevens, governor and superintendent of Indian affairs of the said Territory, on the part of the United States, and [...]

Historiography – The following is a sampling of statements made at the time of the fighting or by later historians (even a novelist). You make the call.
1. Governor Stevens, following his return from east of the mountains, stated:
Fellow citizens! War has existed for three months, and still exists. A war entered into by these Indians, [...]

Links: Medicine Creek Treaty
Medicine Creek Treaty of 1854
NWIF Site – Tribal Treaties
U.S. v. WINANS

White River Massacre
Seattle Battle