>>216596468
>French Guyana
Unironically it's because the colony failed incredibly hard. There were many attempts at developing the colony further during the 17th and 18th century and every time the new settlements would die from disease / get raided by natives / get pillaged by the Dutch or Brits.
Then the country just sort of gave up on the land and used it as a penal colony until the 50s. No other powers tried taking it again because why would they? It's a big piece of jungle that's very underdeveloped and tucked away in a corner of the world no one cared about much at that point.
Since the territory's population was so small and they started getting showered in gibs post ww2 they never really gave a shit about independence themself. They get welfare, healthcare, education, voting rights in France, they can even move to the mainland if they want to. There's like 250 000 of them, fucking Luxembourg has a bigger population so there never was a big enough upper class there to cultivate independentist thoughts.
Also fuck off, of course French ex-colonies are shithole, they weren't settler colonies for the most part. You can't compare Niger to Argentina