Juan Guaidó, Venezuela's opposition leader, declared himself interim president amid nationwide protests earlier this week. The U.S. swiftly proclaimed its support for Guaidó over Venezuela's sitting president Nicolás Maduro. How did the country go from being Latin America’s richest nation and one of its longest-running democracies to total economic collapse and a failed state? Who is in charge? Will the escalating U.S.-Venezuela tensions have an impact on the oil prices? Which countries are supporting Guaidó and Maduro? All your questions answered here.