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Once the richest country in South America, Venezuela is now in deep economic crisis. Children in school are fainting from hunger; patients are dying from the lack of basic medicine. As prices spiral out of control, cash is carried not in wallets, but in backpacks. Street protests over the crisis are growing in size and frequency - and the government's response becoming ever more authoritarian. Yet in 1970, Venezuela was among the wealthiest countries in the world. It was held up as a beacon of democracy and stability - an example of a successful developing economy that turned oil resource wealth into riches. So what went wrong? How did Venezuela go from so rich to so poor? Presenter: Linda Yueh Producer: Simon Maybin (Photo: A father and daughter rest while someone holds their place before sunrise in a long line to buy basic foodstuffs at a supermarket in San Cristobal, Venezuela. Credit: Getty Images)