The group most supportive of gaining control of all the Oregon Country was the

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The northern Democrats were most supportive of gaining control of all the Oregon Country, as they believed in the concept of "Manifest Destiny" and wanted to expand American territory. Southern Democrats were more focused on acquiring territory for the expansion of slavery, while Whigs were divided on the issue and tended to favor compromise. Californians and Protestant missionaries were also interested in Oregon but not necessarily supportive of gaining control of the entire region.

The Group Most Supportive of Gaining Control of All the Oregon