What did Britain lose in the French and Indian war

France lost its mainland possessions to North America.

Explanation:

France lost its mainland possessions to North America. Britain now claimed all the land from the east coast of North America to the Mississippi River. Everything west of that river belonged to Spain. France gave all its western lands to Spain to keep the British out.

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.