B) people of the United States took more vacation
The Democratic Party divided in the 1860 due to the disagreements over slavery.
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Answer:
The most convincing 'internal' factor behind southern defeat was the very institution that prompted secession: slavery. Enslaved people fled to join the Union army, depriving the South of labor and strengthening the North by more than 100,000 soldiers. Even so, slavery was not in itself the cause of defeat.
Explanation: