Answer:1.) The War of 1812 changed the course of American history. Because America had managed to fight the world's greatest military power to a virtual standstill, it gained international respect. Furthermore, it instilled a greater sense of nationalism among its citizens. It prompted James Monroe and John Quincy Adams to pen the Monroe Doctrine, the nation's first articulation of a foreign policy. The entire period of time after the War of 1812, during the presidency of James Monroe, is referred to as the "Era of Good Feeling" for the reasons above.
2.) The Federalist Party, founded by Alexander Hamilton, and once the dominant political party in America, declined precipitously following the War of 1812. Its members had opposed a war with Great Britain.
3.) While the War of 1812 had virtually no impact in England, it did assure the survival of the British colonies in Canada, and ultimately paved the way for the Canadian Confederation - the precursor to the nation of Canada. Some historians believe if the War of 1812 had not happened, Canada would have become part of the United States because so many Americans would have migrated north.
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