To have a land of their own was key for European settlers, since back in their homeland they were unable to do so (they were poor), and land ownership was equivalent to wealth. The more land a person owned, the more powerful and richer he was. Offering such dreamland was the premise for English companies to encourage potential settlers to travel to America.
On the opposite, North American Indians did not believe in land ownership. Everybody was free to own land to live and grow crops in it. They coexisted with nature and constantly moved from land to land, enabling it to recover from their farming activities.
These differences resulted in cruelty towards North American Indians, leading to armed conflicts between them and European settlers.
A large portion of Americans thought that this was not right to be sending over our own people to a place halfway across the globe, to a issue that would not affect us in the the near future. And that this was no ordinary war fought in large open plains. No it was fought in the woods and more. And then american people were dying for a cause that didn't concern them?