Final answer:
The United Kingdom led the way in abolishing the slave trade.
Step-by-step explanation:
The nation that led the way in abolishing the slave trade was the United Kingdom. The United Kingdom outlawed the transatlantic slave trade in 1807, making it the first major power to do so. This was followed by the Slavery Abolition Act in 1833, which abolished slavery throughout the British Empire.
Learn more about abolishing the slave trade