Final answer:
The U.S. won the Battle of New Orleans due to Major General Andrew Jackson's leadership, superior American tactics, home-field advantage, and British troop fatigue, securing the future of American settlement and commerce.
Step-by-step explanation:
The United States defeated the British in the Battle of New Orleans for several key reasons. Major General Andrew Jackson exhibited decisive leadership and quickly organized defenses and a night attack that caught the British off-guard. Superior tactics and strategy, as well as effective home-field advantage, also played a critical role. The American forces were able to strengthen their defenses by the hour, improving their position for the battle. On the other hand, the British troops faced fatigue and logistical setbacks, including a shortage of ammunition, that undermined their ability to sustain an attack and effectively challenge the American defenses. All of these factors contributed to the American victory at New Orleans, which ensured the future of American settlement and commerce and elevated Jackson to national prominence as a war hero.