After a slew of likely contenders such as heart disease, anemia, thyroid disease, depression or a sleep disorder are ruled out, getting to the source of fatigue gets murky. Among the many next-tier suspects is the Epstein-Barr virus (EBV).
Indeed, 2.4 million of those at risk of famine were in southern Sudan, the main arena of the war. Southern Sudan occupies almost one third of the territory of Sudan, which at 2.5 million square kilometers is the largest country in Africa.
In 1937, the Works Progress Administration (WPA) reported that drought was the main reason for relief in the Dust Bowl region. More than two thirds were farmers. Total assistance was estimated at $1 billion (in 1930s dollars).The report found that losses in the Dust Bowl affected the entire national economy. .(Source: Economics of the Dust Bowl, National Drought Mitigation Center.) For more, see Effects of the Great Depression.