•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:

which statement explains one of the reasons world war 1 was so much more destructive than earlier conflicts