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On April 4, 1959, France established the Mali Federation, a union between what are now Senegal and Mali.
The Federation collapsed on August 20 of 1960 when Senegal withdrew due to political disagreements.
Bonus points if you can get it to survive most of the Cold War, super bonus if it survives post-Cold War.
And if you need more incentives, just look at the adorable flag that the world will get out of it 