HELP PLEASE what was the initial cause of the yakama war ? READING GUIDE HOSTILITIES BEGIN PART 1 ‼️

When some of the Yakama warriors retaliated by killing miners in isolated incidents, Andrew J. Bolon, the Indian sub-agent at The Dalles, was sent in to investigate. When he too was killed, troops were sent into the Yakima Valley, starting the Yakima Indian War in October 1855

b)

it created free trade throughout the colonial territories.