Classifier Instance:

Anchor text: Canadian
Target Entity: Canada
Preceding Context: Because the Columbia was at the same latitude as the headwaters of the Missouri River, there was some speculation that Gray and Vancouver had discovered the long-sought Northwest Passage. A 1798 British map showed a dotted line connecting the Columbia with the Missouri. However, when the American explorers Meriwether Lewis and William Clark charted the vast, unmapped lands of the American West in their overland expedition (1803–05), they found no passage between the rivers. After crossing the Rocky Mountains, Lewis and Clark built dugout canoes and paddled down the Snake River, reaching the Columbia near the present-day Tri-Cities, Washington. They explored a few miles upriver, as far as Bateman Island, before heading down the Columbia, concluding their journey at the river's mouth and establishing Fort Clatsop, a short-lived establishment that was occupied for less than three months.
Succeeding Context: explorer David Thompson, of the North West Company, spent the winter of 1807–08 at Kootenae House near the source of the Columbia at present-day Invermere, British Columbia. Over the next few years he explored much of the river and its northern tributaries. In 1811, he traveled down the Columbia to the Pacific Ocean, arriving at the mouth just after John Jacob Astor's Pacific Fur Company had founded Astoria. On his return to the north, Thompson explored the one remaining part of the river he had not yet seen, becoming the first European-American to travel the entire length of the river.
Paragraph Title: null
Source Page: Columbia River

Ground Truth Types:

Predicted Types:

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