Who fought in World War One and the American Civil War?

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This week we look at two numerical claims about wars and who did or didn’t fight in them. Were a third of those that fought for the British Army in World War One of black or Asian decent, and did black men really fight for Confederacy in the American Civil War? More or Less investigates. Presenter: Tim Harford Producer: Lizzy McNeill (Photo: A Black American troop band marching through London at the end of WWI, November 1918. Credit: J.B.Helsby/Getty Images)