Why does ISIS targeted France ?

It is well known fact that the northern African countries are once under French rule. Many people have settled in those countries from France. France has been giving financial aid and support to those countries whenever needed. There were more than 10,000 France soldiers were deployed in Maali, Iraq and Libya countries to attack on ISIS. Just a week back it has also deployed a aircraft vessel near the persian gulf. The attack was planned on a higher notch to attack on the ISIS. This has given ISIS to show its anger on France. ISIS has almost lost its grip in Iraq due to the repeated attacks of France and Russia. So to get back its glory ISIS has attacked on Paris. Well, it is time for all the countries to unite and fight against the terrorism.