Why was Alexander Mackenzie’s 1793 journey across the continent important?

Alexander Mackenzie’s 1793 expedition is historically significant because it marked the first known transcontinental crossing of North America north of Mexico.12

By traveling from Fort Chipewyan across the Rocky Mountains to the Pacific coast of what is now British Columbia, Mackenzie successfully completed an overland journey across the entire continent. This achievement provided a vital link between the interior of the continent and the Pacific Ocean, further stimulating British interest in the region's geography and resources. His exploration, alongside his earlier 1789 journey to the Arctic Ocean, was later documented in his 1801 publication, Voyages from Montreal, on the River St. Laurence, Through the Continent of North America, to the Frozen and Pacific Oceans; In the Years 1789 and 1793.12