There should be no justification of going to war unless the opposing side is harming your country and countrymen, economically, physically, or by isolating you. But as a politician anything that economically benefits my country would be justified if me going to a war. Taylor, had done the same during the Spanish American war by blaming Mexico of stealing Texas back, even though the land was Mexico's back then. He'd done it to enlarge America's land, Manifest Destiny. He spread the propaganda that Mexican troops attacked American, which emotionalism do Americans and they ended up backing up Taylor's decision of going on a war.
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C) rich in oil. The US interest has declined since fracking allow the US of not being so dependant of foreign oil.
Democrats usually link the origin of the party as having been inspired by the "Democratic-Republican Party" founded by Thomas Jefferson with anti monarchical views. The cohesion of the party was put to test over the slavery issue, as southern democrats wanted to extend it to all territories while northern Democrats thought it should be a more restricted issue.
To mass produce instead of writing each Print one-by-one.
*Example: Stamps are use to mass produce Print on envelopes, papers, etc.*