The UN General Assembly on Wednesday designated the transatlantic African slave trade as “the gravest crime against humanity”, despite opposition by the United States and some European countries.In a move advocates hailed as a step towards healing and possible reparations, the resolution was adopted to applause by a vote of 123 in favour, three against and 52 abstentions.The US, Israel and Argentina opposed the measure, while Britain and EU member states abstained.Ghana’s President John...