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As the United States approaches its 250th anniversary, all this week The Global Story is exploring the surprising and often hidden ways the US has shaped the modern world. Today, we are joined by Roman Mars – the host of 99% Invisible and the new �鶹�� series A History of the United States in 100 Objects – who sets out his theory of how the US used design to shape the world in its image. Producer: Sam Chantarasak Executive producer: James Shield Sound engineer: Travis Evans Senior news editor: China Collins (Image: An illustration of a US city rising high above the world’s surface)