Why have some historians rejected the labels bc and ad as labels for periods in world history?

Because they are not culturally inclusive. They are based solely on Christianity:

BC = Before Christ

AD = Anno domini ( Latin for in the year of the Lord)

Now, it is referred to as BCE.

answer: idk

explanation:

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.