The Mammoth Book of Travel in Dangerous Places: North America

First Crossing of America - Alexander Mackenzie
"Endowed by nature with an acquisitive mind and an enterprising spirit", Mackenzie, a Scot engaged in the Canadian fur trade, resolved, as he out it "to test the practicability of penetrating across the continent of America". In 1789 he followed a river (the Mackenzie) to the sea; but it turned out to be the Arctic Ocean. He tried again in 1793 and du...