From here.

If you ever doubt the transformative power of Christ on individuals, read this story and be amazed.

In the late 1700s, when William Wilberforce was a teenager, English traders raided the African coast on the Gulf of Guinea, captured between 35,000 and 50,000 Africans a year, shipped them across the Atlantic, and sold them into slavery. It was a profitable business that many powerful people had become dependent upon. One publicist for the West Indies trade wrote, “The impossibility of doing without slaves in the West Indies will always prevent this traffic being dropped. The necessity, the absolute necessity, then, of carrying it on, must, since there is no other, be its excuse.”

By the late 1700s, the economics of slavery were so entrenched that only a handful of people thought anything could be done about it. That handful included William Wilberforce.

Read it all.