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From about 1860–1895, the United States experienced the following broad changes: Mexican-American War educational changes advances in technology a war with the Spanish industrial revolution an agrarian revolution

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Greenleafable
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.