 The American partnership sold over 20,000 copies of the "Britannica" in the United States (four runs of 5000), after which Hooper and Jackson bought out the two Clarke brothers in early 1900.A & C Black had moved to London in 1895 and, on 9 May 1901, sold all the rights to the "Britannica" to Hooper and Jackson, then living in London.The sale of the "Britannica" to Americans has left a lingering resentment among some British citizens, especially when it is perceived that parochial American concerns are emphasized.