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 <span>Classical economics. It is an expansive term that alludes to the predominant monetary worldview of the eighteenth and nineteenth hundreds of years. Scottish Enlightenment mastermind Adam Smith is generally viewed as the ancestor of traditional hypothesis, albeit prior commitments were made by the Spanish scholastics and French physiocrats. Other imperative supporters of established financial matters incorporate David Ricardo, Thomas Malthus, Anne Robert Jacques Turgot, John Stuart Mill, Jean-Baptiste Say and Eugen Böhm von Bawerk. </span>
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