The correct answer should be Advances in Technology and Industrial revolution
Mexican-American war happened in the 40s so that's before 1860, while a war with Spain occurred in 1898 which is after the mentioned period. They did advance in technology exactly due to the industrial revolution. An agrarian revolution. An agricultural revolution didn't happen in the US because of the Long depression that slowed it all down.
The answer is B.
Freedom Summer was made to expand black people voting,
The action the world should to take deal with isis is to sign some sort of agreement like the US did with Great Britian or we could try to imagrate them to a peaceful union with the world
