[Tax-chick]

Was there much violent bloodshed in settling the land of Oregon?

Yes, quite a bit.

https://www.nps.gov/whmi/index.htm

[Hieronymus]

13 is, in the grand course of things, peanuts. Oregon managed to neatly sidestep the Civil War just a bit more than a decade later.

If you want lots of violent bloodshed, think of the Yankees colonizing the CSA. My great-great Grandmother is buried in Salem, and is remembered by her surviving grandchildren (and was remembered by the deceased ones) as a very bitter woman. She grew up in Southern Missouri in the 60’s—she and Martha Ellen Young Truman would likely have shrugged the Whitman Massacre off.