The famine might have affected the opposition groups by demoralizing them and making them unable to continue their opposition.
What is a famine?
A famine is a widespread scarcity of food, leading to a significant portion of the population suffering from hunger and malnutrition. Famine is a complex and catastrophic event that occurs when there is an extreme shortage of food resources.
When opposition groups are faced with famine, they become very hungry and may become demoralized to the extent of giving up their pursuit. On the map, we can see some opposition groups like the Eritrean People's Liberation Front. The famine would have likely weakened these groups.