 In 1807 Britain and soon after, the United States also, both criminalized the international slave trade.The Royal Navy was increasingly effective in intercepting slave ships, freeing the captives and taking the crew for trial in courts.Although there were numerous slave revolts in the Caribbean, the only successful uprising came in the French colony of Haiti in the 1790s, where the slaves rose up, killed the mulattoes and whites, and established the independent Republic of Haiti.