An excerpt:
"The British abolitionists were shocked by what they came to learn about slavery and the slave trade. They were deeply convinced that they lived in a remarkable time that would see both evils swept from the face of the earth. Like anyone who wages such a fight, they discovered that injustice does not vanish so easily. But their passion and optimism are still contagious and still relevant to our times, when, in so many parts of the world, equal rights for all men and women seem far distant.
The movement they forged is a landmark for an additional reason. There is always something mysterious about human empathy, and when we feel it and when we don't. Its sudden upwelling at this particular moment caught everyone by surprise. Slaves and other subjugated people have rebelled throughout history, but the campaign in England was something never seen before: it was the first time a large number of people became outraged, and stayed outraged for many years, over someone else's rights. And most startling of all, the rights of people of another color, on another continent. No one was more taken aboack by this than Stephen Fuller, the London agent for Jamaica's planters, an absentee plantation owner himself and a central figure in the proslavery lobby. As tens of thousands of protestors signed petitions to Parliament, Fuller was amazed that these were "stating no grievance or injury of any kind or sort, affecting the Petitioners themselves." His bafflement is understandable. He was seeing something new in history.
For fifty years, activists in England worked to end slavery in the British Empire. None of them gained a penny by doing so, and their eventual success meant a huge loss to the imperial economy. Scholars estimate that abolishing the slave trade and then slavery cost the British people 1.8 percent of their annual national income over more than half a century, many times the percentage most wealthy countries today give in foreign aid.
One thing more makes these men and women from the age of wigs, swords, and stagecoaches seem surprisingly contemporary. This small group of people not only helped to end one of the worst of human injustices in the most powerful empire of its time; they also forged virtually every important tool used by citizens' movement in democratic countries today."
by Adam Hochschild
Bury the Chains: Prophets and Rebels in the Fight to Free an Empire's Slaves