Answer:
the north got a lot more factories and started to produce a lot of goods that were needed all over.
The Mexican American War heightened tensions over slavery in that there were many disagreements over whether the new territories won from Mexico should be free or slave territories. The Wilmot Proviso, created to solve the problem, ended up slitting parties on regional areas.
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Propaganda, they inspired more people to join the fight on America's side.
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