sentences:  In their economic discussions, Mandela initially favoured nationalisation as a preferred method for redistributing wealth between blacks and whites, but with British investment in South Africa in 1989 accounting for half of the total, and with bilateral trade worth just over $3.2 billion, Thatcher successfully urged him to adopt free-market solutions, arguing they were necessary to maintain the kind of growth that would sustain a liberal democracy.The NATO nations or in general agreement on delicately handling the collapse of communism in Eastern Europe in 1989, the reunification of Germany in 1990–91, and the end of communism and the Soviet Union in 1991.There was no gloating or effort to humiliate Gorbachev.