Answer: The four countries that claimed the Oregon Country were the United States, Spain, Great Britain, and Russia. John Quincy Adams helped resolve this dispute by negotiating the Adams-Onís Treaty with Spain, which limited Spain's territory to what is currently California's northern border. Spain also gave up their Oregon claims, and Russia gave up their land south of Alaska. Adams also settled the dispute with Great Britain by working out a joint occupation of the area, which granted both American and British citizens the right to settle.
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