United States-Japan relations have evolved significantly since World War II. After the war, the two countries established a strong partnership based on mutual interests, including economic cooperation and security. The U.S.-Japan Security Treaty allows the United States to maintain military bases in Japan, ensuring regional stability. Economically, the United States and Japan are major trading partners, with significant investments in each other's markets. Both nations collaborate on various global issues, such as climate change and technology development, further strengthening their ties. This relationship is crucial for maintaining peace and prosperity in the Asia-Pacific region.