explain how the war of 1812 included examples of national unity as well as examples of division.

In political, economic and national terms.

Explanation:

The examples of national unity in this war are manifested to defend the interests of American merchants. Britain was economically weakened by the wars against France, so they often plundered the goods of American merchants. Even more insulting to the Americans was the fact that from their ships the British abducted sailors and put them under their control. The US authorities wanted to protect their citizens so that they would soon declare war on the British to defend and protect national pride and interests.

On the other hand, some politicians did not want war. These were mostly those from New England, the bankers to whom the war could do a lot of damage. Part of the politicians who advocated the war, apart from defending national interests in the war, saw an opportunity to expand their possessions.  So through this example, we can look at the context of political and national disagreement.