Which country on the African continent has been at war for the longest period?

Explanation

Sudan is a former British colony in Africa. It has some 40 million inhabitants and covers an area of 2,505.810 km². Borders are shared with Egypt, Eritrea, Ethiopia, South Sudan, the Central African Republic, Chad and Libya. It has deserts in the north and rainforests in the south. The country gained independence in 1956 and holds the unfortunate record of being the country on the African continent that has been at war for the longest period.