 With the arrival of a staunchly anti-slavery government in Washington in 1861, the Atlantic slave trade was doomed.In the long run, Castlereagh's strategy on how to stifle the slave trade proved successful.Prime Minister Palmerston detested slavery, and in Nigeria in 1851 he took advantage of divisions in native politics, the presence of Christian missionaries, and the maneuvers of British consul John Beecroft to encourage the overthrow of King Kosoko.