Because the Hebrews were vulnerable
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This view by W.E.B. DuBois contributed most to the creation of the National Association for the Advancement of Colored People.
William Edward Burghardt Du Bois was an American Civil Rights activists leader. He was among the founders of the National Association for the Advancement of Colored People (NAACP). He insisted that blacks needed legal rights and economic opportunities to develop their capacities and realize their cultural potential and because of that he helped to create the association.
The Treaty of 1818 between the US and Britain stated the Oregon Country would be jointly occupied by the US and Britain. But it resulted in disputes between Americans and British and another treaty, the Oregon Treaty, was signed in 1846. It stated the Oregon Country would be divided in two. The US would get all the land south of the 49th parallel (which eventually became the states of Washington and Oregon) and the British would get all the land north of the 49 parallel (which became British Columbia). Except for Vancouver Island off the coast of the Oregon Country, 4/5's of Vancouver Island was north of the 49th parallel so the US said Britain could have all of it instead of splitting it at the 49th parallel.