War of 1812
United States

The nation gained a strong sense of complete independence as people celebrated their "second war of independence". Nationalism soared after the victory at the Battle of New Orleans. The opposition Federalist Party collapsed due to its opposition to the war and the Era of Good Feelings ensued.

No longer questioning the need for a strong Navy, the United States built three new 74-gun ships of the line and two new 44-gun frigates shortly after the end of the war. In 1816, the United States Congress passed into law an "Act for the gradual increase of the Navy" at a cost of $1,000,000 a year for eight years, authorizing nine ships of the line and 12 heavy frigates. The captains and commodores of the Navy became the heroes of their generation in the United States. Several war heroes used their fame to win elections to national office. Andrew Jackson and William Henry Harrison both benefited from their military successes to win the presidency, while representative Richard Mentor Johnson's role during the war helped him attain the vice presidency.

During the war, New England states became increasingly frustrated over how the war was being conducted and how the conflict affected them. They complained that the United States government was not investing enough militarily and financially in the states' defences and that the states should have more control over their militias. Increased taxes, the British blockade, and the occupation of some of New England by enemy forces also agitated public opinion in the states. At the Hartford Convention held between December 1814 and January 1815, Federalist delegates deprecated the war effort and sought more autonomy for the New England states. They did not call for secession but word of the angry anti-war resolutions appeared as peace was announced and the victory at New Orleans was known. The upshot was that the Federalists were permanently discredited and quickly disappeared as a major political force.

This war enabled thousands of slaves to escape to freedom, despite the difficulties. The British helped numerous escaped slaves resettle in New Brunswick and Nova Scotia, where Black Loyalists had also been granted land after the American Revolutionary War.

Jackson invaded Florida (then part of New Spain) in 1818, demonstrating to Spain that it could no longer control that colonial territory with a small force. Spain sold Florida to the United States in 1819 under the Adams–Onís Treaty following the First Seminole War. Pratt concludes that "hus indirectly the War of 1812 brought about the acquisition of Florida".
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