They used a phased approach and bought the slaves out of bondage. That was not even tried in the US. Our federal government used aggression as the only recourse and didn't even attempt a peace commission.
“Compensated emancipation”. I think it was actually done within Washington DC during the war.
The Brits chose to end slavery without bankrupting those who were invested in it while it was legal. Abolitionists in the US couldn’t have cared less about what the downstream effect would be. They were zealots, and even Lincoln wasn’t fond of them.
“Our federal government used aggression as the only recourse and didn’t even attempt a peace commission”
Confederates convened a peace conference in Washington DC in February 1861 in the attempt to avoid a war. Former US President John Tyler was a member. There wasn’t an equal interest from President Buchanan. And then Lincoln believed that a short war would force the seceded states back into the Union.