Final answer:
The greatest American victory in the War of 1812 was the Battle of New Orleans, where American forces defeated the British even after the Treaty of Ghent had been signed, though not yet ratified. This triumph marked a significant milestone in American history, bolstering national pride and confirming sovereignty.
Step-by-step explanation:
The greatest American victory in the War of 1812 was the Battle of New Orleans. This significant battle took place after the signing of the Treaty of Ghent, which had ended the war, due to slow communication. The British attacked New Orleans on January 8, 1815, but were soundly defeated by American forces under the command of General Andrew Jackson. This victory was celebrated as a display of American resilience and strength.
The War of 1812 itself was instigated by issues which included British impressment of American sailors and the arming of Native American tribes against the United States. Although the Treaty of Ghent restored pre-war boundaries, the war was important for fostering American national pride and confirming the country's sovereignty from Britain.