Ivory Coast background - France enables a local despot, known as Felix Boigny, who does enable local economic growth but institutionalizes power to such an extent that the county falls into civil war and disrepair upon his death in the 1990s, leading to two civil wars in which France plays a major role.
Togo coup of 1963 in which France played a role - Togo remains a dictatorship for 53 years and now has a large and enraged protest movement. The regime has been responsible for the deaths of thousands of dissidents.
Cameroon's backing of Paul Biya - Despite his continued anti-democratic manners and blatant electoral rigging, France sticks by their man, leading to now a insurgent civil war in Anglophone Cameroon.
The Libyan intervention - What can be said that hasn't been said, a new failed state, arms flowing across the subregion which leads to trouble across the Sahel in Mali and Northern Nigeria.
And these are just a few examples.