The Five-Year Plans were programs of economic development instituted in the USSR by Joseph Stalin. The first, announced in 1927, began thorough industrialization under state planning and collectivized agricultural production. Despite successes on paper, the state planning suffered from mismanagement, investment was often squandered on grand projects, and the human cost was immense. In spite of these problems, Stalin managed to transform backward Russia into the modern, industrial power that was the USSR, an achievement that, for many, proves the benefits of planning under a socialist government.
Nelson Mandela made many changes to South African society, most notably by transitioning the country away from the racist policy of apartheid. Apartheid was a government policy that kept white Afrikaners in South Africa at the top of politics and business while limiting the rights of black citizens. As the first post-apartheid president, Nelson Mandela created a diverse society in which every citizen is equal before the law.
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It would be "C) eliminating trial by jury" that was mentioned in the list of King George III's wrongdoings, since the colonists felt that there individual liberties had been robbed from them.