According the excerpt, the slave trade in West Africa

little more context?

Explanation:

the slave trade was a trade system (also known as the Atlantic trade slave or triangle trade) that traded slaves to america, raw goods, like lumber, to Britain, and finished goods, like guns, to Africa.

operation overlord was the codename for the battle of normandy, the allied operation that launched the successful invasion of german-occupied western europe during world war ii. the operation was launched on 6 june 1944 with the normandy landings

i would go with the last one