Assembly lines increased production of products. Someone or a machine would add one part and then go to the next machine/person and add the next part.
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During the antebellum and Civil War periods, social contract theory was used by all sides. Slaveholders used it to support states' rights and succession, Whig party moderates upheld the social contract as a symbol of continuity in government, and abolitionists found support in Locke's theories of natural rights.
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Answer: Chemical weathering changes the chemical makeup of rocks, transforming their minerals or combining them with new elements. Many caves have been formed from this. This is the wearing away of the earth's surface by wind, glaciers, and moving water.
Thomas Jefferson said that all men have the right to life, liberty and the pursuit of happiness (though Jefferson did not originally think of the last one). Keep in mind that by "men" he means white, well-off men, not women or slaves.
