The fact is they aren’t illegal - they are from former French colonies who were given legal entry into France on that basis, yet France has made no effort to assimilate or educate them.
It’s what we face here if we don’t assimilate the hordes of immigrants we allow in every year, not even mentioning our illegal alien problem..
You have that exactly backwards.
France did not force them to move to France. They came of their own free will, hoping to better their situation.
The responsibility to assimilate is on them.
Let me give you an example. Up until about 50 years ago there was blatant discrimination against Chinese, Japanese, and other asians throughout the US and particularly here in CA.
But, they persisted, assimilated, and worked hard. Today , if a community has a substantial asian population, many times a majority, housing prices are significantly higher than in surrounding towns. The real reason is that everyone knows the school system will be excellent, and crime will be low.