Harriet Tubman on $20 Bill

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Reaction to the US Treasury's announcement that anti slavery activist, Harriet Tubman will be the first woman to appear on a US banknote for more than a century. And what's it like in Nigeria where a petrol shortage is crippling the country Image: An image of Harriet Tubman, between 1860 and 1875. Credit: H.B. Lindsley/Library of Congress/AP