What is sentence four referring to (“But when a long train of abuses…for their future security.”)?

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.

not sure might be he acquired the entire oregon territory from great britain

d. a week

hope this

a big one is

to appoint and regulate officers of the land and naval forces,

which caused much controversy ending the articles