13 equal horizontal stripes in red and white, with a navy blue square in the top left bearing 50 small white five pointed stars. It's recognisable the world over as the flag of the United States of America.

But how did this become the American flag? When did it develop its own 'cult'? And does Betsy Ross have anything at all to do with this story?

Don is joined by Marc Leepson, author of Flag: An American Biography.

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