What would prevent settlements from moving too far west?

After the Indians were defeated, thousands of settlers hurried west. Some hoped ... If he built a home on the land, and farmed it for five years, it would be his. He paid just ... So it was hard to keep animals away from crops. ... Much of the grain was sold in Europe and farmers got good prices.

Explanation:

in february 1787, congress decided that a convention should be convened to revise the articles of confederation, the nation’s first constitution. in may, 55 delegates came to philadelphia, and the constitutional convention began. debates erupted over representation in congress, over slavery, and over the new executive branch. the debates continued through four hot and muggy months. but eventually the delegates reached compromises, and on september 17, they produced the u.s. constitution, replacing the articles with the governing document that has functioned effectively for more than 200 years.