Why were casualties for the union so much more than that of the confederacy?

The confederates used very defensive tactics that allowed them to stay on home turf and win many small battles.

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.

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