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In 1807 Britain enacted the Slave Trade act banning the slave trade in the british empire. That was the same year where the US act of prohibiting importation of slaves was finally enacted after a twenty year delay.
The British navy actually sent out ships to patrol and stop slave ships leaving the west coast of africa with slaves, the West africa Squadron.
What do you think would have been the outcome had the US not issued the act to prohibit the importation of slave or set a much later date for it to come into effect?
Would Britain have allowed the US to continue importing slaves? Could this be grounds for conflict between the two?