Well, the main goal of the Whig Party was to promote Henry Clay's American System...which consisted of massive government funding of internal improvements (what we now refer to as infrastructure), protectionist tariffs, and central banking. So really, the Whigs never left, they just morphed into the modern Republicans and Democrats when the Civil War threw Jeffersonian/Jacksonian democrats and state checks on federal power into ill-repute.
In a way, it wasn't "the union" that won the civil war...it was the ghost of Alexander Hamilton.
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