‘‘The Lewis and Clark Expedition put these armchair geographical theories to rest'' in August and September of 1805, in present-day Montana and Idaho, he said in a foreword to Hall's guidebook. ‘‘The ...

In the Spring of 1803, the United States acquired the Territory of Louisiana, a largely uncharted tract of wilderness stretching from Canada all the way down to New Orleans, over 800,000 square miles ...

On at least nine occasions, Capt. William Clark relied on indigenous maps to chart the course and geography of the Lewis and Clark Expedition. Kevin O’Briant of Missoula will tell the story Thursday ...