The new museum opened on 23 August 2007, the date of the annual International Day for the Remembrance of the Slave Trade and its Abolition marking the beginning of the slave uprising in Saint-Domingue. The year 2007 was particularly significant as it was the bicentenary of the United Kingdom's Slave Trade Act of 1807, which abolished the slave trade (though not slavery itself) inside the British Empire. The Merseyside Maritime Museum used to house a Transatlantic Slavery Gallery. Phase 1 of the International Slavery Museum involved relocating current exhibitions to the third floor of the museum and adding new displays, which doubled the space dedicated to the subject.