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What is the main responsibility of the U.S. Department of State?

The U.S. Department of State is responsible for the country’s foreign affairs, advising the president, representing the United States abroad, and managing relationships with foreign governments and international organizations. Created in 1789, it is the oldest and one of the most influential departments of the federal government. The department is headed by the secretary of state, who is often referred to as the “chief diplomat” of the United States.