When was slavery abolished in England?
Slave Trade Act 1807
The United States adopted its Act Prohibiting Importation of Slaves on March 2, 1807, the same month and year as the British action.  It provided for the abolition of its Atlantic slave trade but did not alter its internal trade in slaves. Article 1, Section 9, Clause 1 of the United States Constitution forbade the closing of the slave trade for twenty years, until 1808. The long-planned law was passed a year earlier, and with the economic incentives of the slave trade coming to an end, there was both a spike number of slaves being traded and a unification of political factions against the trade.[9]