4- they feared attacks. from Japan and Korea.
5-the cost of maintain overseas
6-the french colonist did not try to convert
France was a wealthier country than Britain, and its national debt was no greater than the British one. ... The financial strain of servicing old debt and the excesses of the current royal court caused dissatisfaction with the monarchy, contributed to national unrest, and culminated in the French Revolution of 1789.
The Romans destroyed the city of Carthage :)
People give up certain rights to a government in order to maintain social order. Hope this helped!