The president most responsible for obtaining the lands of california, oregon, and new mexico for the united states was a) thomas jefferson . b) martin van buren. c) james k. polk. d) john tyler.

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.