why do you think the period from 1877 to world war 1 can be called the beginning of the "long american century"?

c 3 branches because idk why they had 3 well when:

you think of it there are still contrys with 3

cruel, heartless

explanation:

it might be to see if the person answering knows what they are talking about other than just saying, "its b hope this ! : )" because they could say it then get the wrong answer because they only answered for the points.