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Scientific discoveries, such as the theory of relativity and the discovery of radiation, caused previously established beliefs on reality and the earth to come further into question. This caused many people to begin to see the world in which they worked in as one without boundaries and absolutes.

Explanation:

lincoln presided over the union victory in the american civil war, which dominated his presidency. a former whig, lincoln ran on a political platform opposed to the expansion of slavery in the territories. his election served as the immediate impetus for the outbreak of the american civil war.