USA HISTORY

Detailed explanation-1: -Answer and Explanation: The Oregon Trail crossed the Rocky Mountains at the South Pass, where travelers crossed the Continental Divide.

Detailed explanation-2: -In 1793, Sir Alexander MacKenzie became the first European to cross the Rockies. He was followed years later by the famous Lewis and Clark Expedition, which became the first scientific reconnaissance of the mountain region.

Detailed explanation-3: -These selections from Meriwether Lewis’ journal describe the crossing of the Rocky Mountains, a particularly hazardous stretch of the Lewis and Clark Expedition.