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Hundreds of thousands of people took to the streets of Tehran and other cities across Iran on Monday to mark what is considered victory day in the country's 1979 Islamic Revolution. Crowds streamed in the rain from a dozen of the capital's neighborhoods to mass in central Tehran's Azadi Square, waving Iranian flags, chanting "Death to Israel" and "Death to America". Relations worsened after the U.S. withdrew from the Iran nuclear deal. Here is a recap of what happened since then.