It didn't. The war was long over before expansion west of the original 13 colonies began and the US did not reach the Pacific Ocean until well AFTER the Louisiana Purchase (which did not include Oregon and Washington even though Lewis and Clark explored all the way to the Pacific). The first actual US territory on the Pacific was California.
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1. They had to form a new government.
2. Some states in the North outlawed slavery.
3. They wanted more religious freedom.
4. They wanted more freedom.
the british
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To prevent the British from establishing a second western front in the Revolutionary War.
All former British territories west to the Mississippi.
There were no wars happening within the Revolutionary War. The only actual war that was going on at this exact time and place was the Revolutionary War.