The ‘March of Suffering’ was a devastating famine in:  

The 'March of Suffering' (often translated as Arduous March or "Gochonan Haenggun" in Korean) refers to the devastating famine that struck North Korea in the mid-1990s. This period, roughly from 1994 to 1998, was characterized by widespread starvation, economic collapse, and a severe food crisis, leading to the deaths of hundreds of thousands, possibly millions, of North Koreans. The famine was exacerbated by a combination of factors including natural disasters, the collapse of the Soviet Union (which had provided aid), and the mismanagement of the country's centrally planned economy. Sudan has experienced severe famines, particularly in the 1980s and early 2000s, but they are not known by this specific moniker. Guatemala has also faced food insecurity but not a famine referred to as the 'March of Suffering'. Therefore, North Korea is the correct answer, representing a tragic chapter in its history.