The U.S. Department of State is the federal executive department responsible for the country's foreign affairs. Established in 1789, it manages international relations, negotiates treaties, and represents the United States at the United Nations. The department is led by the Secretary of State, who is the President's principal advisor on foreign policy. The Department of State also oversees the issuance of passports and visas, ensuring the safety of American citizens abroad. It works to promote peace, democracy, and human rights globally, while also addressing issues like trade, climate change, and security through diplomatic efforts.