Answer:
Dr. Marcus Whitman and his wife, Narcissa, went to Oregon in 1836 and built a mission among the Cayuse people near the present site of Walla, Walla Washington
-new settlers unknowingly brought measles to the mission
-an epidemic killed many children of the Cayuse
-blaming the Whitman's for the sickness, the Cayuse attacked the mission killing the Whitman's and 11 others
Explanation:
located between the Pacific Ocean and the Rocky Mountains north of California
-four nations (United States, Great Britain, Spain and Russia) claimed the land