The 'triangular trade' was the sailing route taken by British slave traders. It was a journey of three stages:
A British ship carrying trade goods set sail from Britain, mainly from Liverpool or Bristol, bound for West Africa.
At first some slaves were captured directly by the British traders.
Most slave ships got their slaves from British 'factors', who lived full-time in Africa and bought slaves from local tribal chiefs. The slaves were marched to the coast in chained lines where they were held in prisons called 'factories'.
The slave ship then sailed across the Atlantic to the West Indies – this leg of the voyage was called the 'Middle Passage'.
On arrival in the West Indies the slaves were sold at an auction.
Some ships then loaded up with sugar and rum to sell in Britain, before making the voyage back home.