Why did settlers begin moving further west?

Settlers tended to move westward due to overpopulation and limited usage of lands. Newer generation Americans & those who were able to pay off their debts after being indentured servants, demanded for land of their own. However, with the limited amounts of land, they were forced to move westward to claim their "rightful land". This led to clashes between the settlers & the Indian tribes, who were promised that the Americans would not move past a designated line multiple times. However, with the greed for farmlands, the settlers failed to uphold the treaties, and took the land.

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we can argue that appeasement caused world war ii because it allowed hitler and the nazis to build germany’s military power until it was strong enough to fight a major war. additionally, appeasement emboldened germany, making it think the allies would never have the will to fight. this made germany much more aggressive and encouraged it to take the steps that eventually led to war.