•economic and social changes in the united states: how had the nation changed since 1800?

answer:

to u.s. global leadership in natural gas and oil production, petroleum imports (crude oil and refined products) are at their lowest level since the 1960s. americans can look to the future from a position of energy strength – more self-sufficient, energy secure and able to provide leadership around the world, friends and deterring adversaries.

explanation:

c, because the american revolution was from 1765 to 1783.

the treaty of brest-litovsk was a peace treaty signed on 3 march 1918 between the new bolshevik government of russia and the central powers (german empire, austria-hungary, bulgaria, and the ottoman empire), that ended russia's participation in world war i.