How did the Mexican War contribute to feelings of sectionalism in America?

There was disagreement over whether land gained as a result of the war would be free or slave. was unnecessary. ... They opposed the Kansas-Nebraska Act because they were against the expansion of slavery into new states.

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states began imposing duties on each other's goods. congress had no way to raise money for an army to expel them.

a historian who compares the expansion of political systems to the expansion of economic systems to the expansion of economic systems is organizing history by theme.

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