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It was in the 1800's. I learned about it 2 or 1 month ago. They bought it after Meriwether Lewis and William Clark discovered the Oregon Country. It included Idaho, Oregon[of course], Part of Montana, and Washington. -In 1819, Oregon was claimed by four nations-Russia, Spain, Great Britain and the United States. Spain was first to drop out of the claim, then Russia agreed to limit it's claim to the 54 degree 40' parallel of latitude, which is today's southern border of Alaska. In 1825, Britain and the United States agreed to a peaceful "joint occupation" of Oregon. In 1846, after a change in government, the United States made a treaty with Great Britain. They agreed to split Oregon Country in half, on the 49th parallel, which is now the northern border of Washington, Idaho, and Montana.

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