Because in “Thomas Jefferson’s America, 1801” --Stephen Ambrose “Reporting to the President, September 23- December 31, 1806” (pages 418-21),if there was only a few heroes in history we might not have had the expedition of Lewis and Clark. Because Lewis and Clark couldn't have done the expedition alone because the expediton required a lot more manpower than just them two. This also builds on the other central idea “Average citizens were responsible for westward expansion”.
Morgan made a lot of valid points when he said, “Average citizens were responsible for westward expansion”. Because in the story “No True History of Westward Expansion” he said when Andrew Jackson won at the battle of Horseshoe Bend but people only remember Jackson but not the people who died to win the battle. Also he explains that Thomas Jefferson wasn't the reason for westward expansion but was a major catalyst he did set America on the road to it. Chief Joseph also build on to these ideas in “Chief Joseph