Assuming that the young man supported the union side, he could write to someone who supported the confederation side explaining his reasons persuasively.
It took place in the United States from 1861 to 1865, with the country divided into two sides, the Union and the Confederacy, being an internal war motivated by the expansion of slavery in the country, in addition to sectionalism and secession.
Therefore, a young man who supported the Union side, probably had the anti-slavery view, because he supported the legitimacy of the pre-existing policy in the country, preserving the country as a constitutional union.
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