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In 1960, 70 black protesters were killed during a peaceful demonstration in Sharpsville. The African National Congress (ANC), the principal antiapartheid organization, was banned that year, and in 1964 its leader, Nelson Mandela, was sentenced to life imprisonment. Black protests against apartheid grew stronger and more violent. In 1976, an uprising in the black township of Soweto spread to other black townships and left 600 dead. Beginning in the 1960s, international opposition to apartheid intensified. The UN imposed sanctions, and many countries divested their South African holdings.
The coastal periphery was the home to some of the world's earliest known civilizations, with each of the three regions developing early civilizations around fertile river valleys. These valleys were fertile because the soil there was rich and could bare lots of root crops. The civilizations in Mesopotamia, the Indus Vally, and China shared many similarities and likely exchanged technologies and ideas such as mathematics and the wheel. The northern part of the continent, covering much of Siberia was also inaccessible to the steppe nomads due to the dense forests and the tundra. These areas in Siberia were very sparsely populated.