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British explorer David Thompson posted a notice at the confluence of the Columbia and Snake Rivers (in modern Washington state, U.S.), claiming the area for Great Britain.
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David Thompson (explorer)
Canadian fur trader and surveyor (1770–1857)
David Thompson was an Anglo-Canadian fur trader, surveyor, and cartographer, known to some native people as "Koo-Koo-Sint" or "the Stargazer". Over Thompson's career, he travelled 90,000 kilometres (56,000 mi) across North America, mapping 4.9 million square kilometres of the…Source: Wikipedia (CC BY-SA)
Columbia River
River in the Pacific Northwest of North America
The Columbia River is the largest river in the Pacific Northwest region of North America. The river forms in the Rocky Mountains of British Columbia, Canada. It flows northwest and then south into the U.S. state of Washington, then turns west to form most of the border between…Source: Wikipedia (CC BY-SA)
Snake River
Major river in the northwestern United States
The Snake River is a major river in the interior Pacific Northwest region of the United States. About 1,080 miles (1,740 km) long, it is the largest tributary of the Columbia River, which is the largest North American river that empties into the Pacific Ocean. Beginning in…Source: Wikipedia (CC BY-SA)
Washington (state)
U.S. state
Washington, officially the State of Washington, is a state in the Pacific Northwest region of the United States. It is often referred to as Washington State to distinguish it from the national capital, both named after George Washington. Washington borders the Pacific Ocean to…Source: Wikipedia (CC BY-SA)