Final answer:
The Whig-Democrat party alignment was shaped by the issue of slavery in the United States during the 19th century, leading to internal divisions within both parties and eventually contributing to the Civil War.
Explanation:
The Whig-Democrat party alignment was influenced significantly by the issue of slavery in the 19th century United States. The Whig Party, which later dissolved over slavery concerns in the 1850s, and the Democratic Party had differing stances on slavery, leading to internal divisions within the parties.
During this period, the president's actions regarding slavery, such as rejecting support for antislavery measures, caused further rifts within the Whig and Democratic parties. This political landscape eventually culminated in the Civil War and the formation of the Republican Party.
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