1970s, People became more interested in protecting the environment., The Vietnam War ended, and the USA left Vietnam., The oil crisis caused high prices and economic problems in many countries., 1980s, The Berlin Wall fell, Personal computers started to appear in homes and offices., The Cold War began to end, 1990s, The Soviet Union collapsed, ending the Cold War., The internet became popular around the world., Global trade and travel increased quickly., 2000s, The 9/11 attacks changed world politics and security., Social media and smartphones became part of daily life., The 2008 financial crisis caused economic problems worldwide..

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