Answer:
The North was where all the ‘free’(anti-slavery) states were and slaves wanted to escape to a free state or to Canada.
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Labor force was needed in cities and thus jobs were offered plentifully
Explanation:
In the late 1800s industrialization created a tremendous amount of jobs and attracted a similar quantity of immigrants.
The government wanted to keep the number of free and slave states equal so that neither of would throw off the balance of congress.
For example, if there was more slave states in congress, then most likely the laws would be made in favor of slavery. Or vice versa.
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In the 1840s, the American Party, known popularly as the "Know Nothing Party", was against immigration on the grounds that foreigners would take American jobs. This party wanted to strictly limit, if not eliminate, immigration to the US and were known for their violent opposition to it. By 1860, this party was essentially extinct, though nativist sentiment can still be found in pockets of American society.