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well done research like all of David Lavender's books, good use of quotes from travelers journals. The background was maybe too much, began with the beginning of the fur trade in New France rather than the beginning of the overland trails. On the other hand he was right that the Westward Movement began with fur trade and the fur trade began with the French.
One very interesting point was the many times that South Pass was discovered and forgotten again before it became the main way over the Rockies.
One very interesting point was the many times that South Pass was discovered and forgotten again before it became the main way over the Rockies.