3. 1812 War to Peacetime Cooperation
The War of 1812, fought between the United States and Great Britain, was the last major military conflict between the two nations. Its conclusion led to a gradual thawing of relations, and in the ensuing decades, the nations began resolving disputes diplomatically. This shift paved the way for increased cooperation in various areas, including trade and territorial expansion. For more details, see Smithsonian: War of 1812.
