The following actions contributed to the growth of Oregon:
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John Jacob Astor established the first settlement in Willamette Valley. - This action helped lay the foundation for further settlement and development in the region.
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President Polk negotiated the Treaty of 1846 with the British, which gave the United States control of Oregon. - This treaty formalized U.S. control over the Oregon Territory, encouraging more migration and settlement.
While Astor's establishment of sawmills would contribute to the economic growth of the area, the first two actions are more directly linked to the initial growth and development of Oregon. The action regarding the relocation of Native Americans, while part of a broader policy during that period, is more complex and does not directly contribute to the growth of Oregon in the same way as the others listed.