Because Boone want more room so he move west and, when more people came with him he move west
Economic forces: Land in the West was cheaper and available for purchase for those who migrated west. There were farming opportunities in the West, while the East was becoming more crowded and developed. Social forces: Friends and family that had moved west would write letters to those in the East, convincing them to move and take advantage of all of the opportunity in the West.
Because Boone want more room so he move west and, when more people came with him he move west
They helped people to move west. This helped with the growth that was seen out west because people could get out there more quickly.
More Money More Land More Businesses
There was more room and the ground was more fertile
Many more people were able to move west
To get more land to grow cotton!
Gold
The people that continued to move West in the United States did it to continue to discover. Once reports of gold being in the West more people flocked to see if they could get rich.
Lewis and Clark explored the West helping others to understand the terrain, etc.
Some areas are less populated than other areas of the US, more country