Republic of Equatorial Guinea
Who & why: independence from Spain arrives on 12 October 1968 under President Francisco Macías Nguema, whose rule quickly turns into one of postcolonial Africa's most extreme dictatorships — mass killings, forced labor, and the flight of roughly a third of the population into exile before his own nephew, Teodoro Obiang Nguema Mbasogo, overthrows and executes him in a 1979 coup. State factually: Obiang has ruled ever since, making his one of the longest tenures of any head of state in the world, with oil wealth discovered in the 1990s doing little to change the country's governance. The flag, adopted at independence, has survived both regimes essentially unchanged, its shield redesigned in detail (a variant silk-cotton tree emblem) without altering the overall design.
What it represents: green for the mainland's vegetation, white for peace, red for the blood of those who died winning independence, and the blue hoist triangle for the sea linking the mainland and island territories; the central coat of arms bears a silk-cotton tree under which early treaties with Spain were reputedly signed.