20. How does the vote on the War of 1812 in Congress reveal a deep sectional division
in the United States? Why does Madison
feel this war is necessary?

Many people against the war.

Explanation:

The vote on the War of 1812  in Congress reveal a deep sectional division  in the United States because many  people were against this war which shows division of thoughts among congress members. Madison  feel this war is necessary because the Britain did not stop seizing American ships which traded with the France. the main reason for this seizing is the bad relations among France and Britain.

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