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The Buchanan-Pakenham Treaty resolved the outstanding border dispute with Great Britain over the Oregon Territory by extending the border between British Canada and the United States along the 49th parallel all the way to the Pacific coast.
True

Sagot :

The border between British Canada and the United States was extended along the 49th parallel all the way to the Pacific coast as part of the Buchanan-Pakenham Treaty, which ended the ongoing border dispute with Great Britain over the Oregon territory.

Oregon Territory

The region was first claimed by Spain, Great Britain, Russia, and the United States. Spain was obligated by the terms of the Transcontinental Treaty to give up its claims to the area to the United States in 1819. Soon after, the Russian government unilaterally decided to give its nationals a fishing, whaling, and commercial monopoly from the Bering Straits to the 51st parallel.The USA disagreed with this ruling. President Monroe published his theory in 1823, alerting Russia to the fact that the United States did not recognize their ambitions at monopoly.The explorations of the Lewis and Clark expedition and the establishment of commercial hubs like Astoria at the mouth of the Columbia River by the Pacific Fur Company laid the groundwork for the U.S. claim.On what Great Britain claimed.

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