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As the United States approaches its 250th anniversary, The Global Story is this week exploring the surprising and often hidden ways the US has shaped the modern world.

President Donald Trump’s attempts at regime change in Iran and Venezuela, controversial as they are, reflect the US’s long history of using both military and covert operations to achieve its goals abroad.

One of the forefathers of this approach to foreign intervention was Allen Dulles, the first civilian head of the Central Intelligence Agency, who used undercover – and often morally dubious – tactics to topple global leaders deemed unfriendly to America’s interests.

On today’s show, Tim Weiner, author of Legacy of Ashes: The History of the CIA and The Mission: the CIA in the 21st Century, joins Tristan and Asma to explain how Dulles' legacy played out through the ‘War on Terror’ and how it has helped shaped today’s US foreign policy.

Producers: Hannah Moore and Aron Keller

Mix: Travis Evans

Executive Producer: James Shield

Senior news editor: China Collins

Photo: An illustration similar to the CIA seal. Credit: Â鶹Éç