•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:

i would say b. or c.

polisit can also mean a body of citizens. in modern historiography, polis is normally used to indicate the ancient greek city-states, like classical athens and its contemporaries, and thus is often translated as "city-state". the body of citizens came to be the most important meaning of the term polis in ancient greece.