The Full Story
Lord Palmerston didn't believe in asking nicely.
As Foreign Secretary, Palmerston transformed British anti-slavery policy from polite diplomacy to aggressive enforcement. Treaties were backed by threats. Negotiations came with ultimatums. Nations that refused to cooperate faced consequences.
Portugal learned this in 1839 when Palmerston authorized the seizure of Portuguese slave ships without Portuguese consent. Spain learned it when British vessels operated off Cuba despite Spanish protests. Brazil learned it when Royal Navy ships sailed into their harbours.
Palmerston's methods were controversial. Other nations called Britain arrogant, hypocritical, imperialist. They weren't entirely wrong. Britain was using naval supremacy to impose its will.
But Palmerston didn't care about the accusations. He cared about results. Under his leadership, the Atlantic slave trade collapsed. Millions of people who would have been enslaved remained free.
Was it imperialism? Perhaps. But it was imperialism in service of human freedom. Palmerston would have called that a price worth paying.
Why This Matters
Palmerston's aggressive abolition policy raises difficult questions. Can imperialism serve moral ends? Britain imposed its anti-slavery values on the world through force. The slave trade ended. Was that wrong?