A Foreign Minister's powers can vary from government to government. In a classic Parliamentary system a Foreign Minister can have genuine influence on forming foreign policy. However, with a strong Prime Minister or in a Presidential system, a Foreign Minister can be more advisory or outright ignored. While it was common for a head of government to assume the foreign ministry in the 19th or early 20th centuries, this is not as common anymore. It does still happen though, however it is mostly confined to newly independent or still developing nations.
In the United States, the Foreign Minister is called the Secretary of State, and is the oldest cabinet post in the US. In the United Kingdom, the Foreign Minister is called the Foreign Secretary, and has officially been called the Secretary of State for Foreign and Commonwealth Affairs since 1968, when the previously separate Foreign Office and Commonwealth Office were merged. From 1782 to 1968, the Foreign Secretary was called Secretary of State for Foreign Affairs. Before that, the Foreign Secretary was known as the Secretary of State for the Northern Department.
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