Plot: How did a people who thought themselves free end up subjugating so much of the world, a nation with such a distrust of armies become the greatest military power on Earth, an empire of the free become an empire of slaves?Britons took the flag across the globe and created an empire built on ambition and slavery, exploration and daring. Trade flourished in the addictive commodities of tea, sugar and coffee, as did the deplorable trade in people