When was the first European crossing of North America from coast to coast accomplished?

Question

Leif Ericson, a Norse explorer regarded as the first European to land in North America before Christopher Columbus, established a settlement at Vinland, which has been tentatively identified as being where?

Answer 1

1792-93
Alexander Mackenzie crossed Canada from Fort Chipewyan on the east coast to Bella Coola, British Columbia, on the west. He also returned via the same route, the only early transcontinental traveller to do so. The dates 1803-06 are the more famous transcontinental expedition by Lewis and Clark.