What theory was used to encourage farmers to settle in the great plains states?

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.

this act gave the federal government the power to relocate any native in the east to territory west of the mississippi river.