Why was there tension between the US and American Indians in the Northwest Territory in the early 1800s?

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by creating a labor shortage that pushed the continent toward a market economy

the answer that best explains what happened to george washington at fort necessity, pennsylvania is : washington was attacked by the french but was able to negotiate with them to peacefully end fighting. the battle took place on july 3, 1754. the battle is considered as being the start of the french and indian war.