The thing that made me think of the African Americans in this context was the fact that they compare with Muslims in the fact that the new arrivals do better than the ones brought up in the country. This seems to be at least partially true of the Muslim populations. But maybe you have statistics I haven't seen.
It may be possible but I actually saw two divergent studies on this question, both with methodological problems. The prohibition of ethnic statistics render those studies difficult.
That is NOT the major problem in France.
On the opposite our identity crisis is our biggest problem, with severe economic impacts. The loss of trust and optimism have immense consequences for an economy, and they are in large parts caused by societal factors such as
the cost of multiethnicity and the dismantlement of national democracies in favor of an international bureaucracy.
Besides this new international order has important responsibilities in our economic situation. Being prohibited to tackle our trade deficit by any other way than long-term changes actually causes large losses by the time those changes produce effects. And in no country deep reforms can be conducted quickly, even though France has a worse track record on this matter.
France's key stumbling block is its attitude toward "work". It has a Legal Code defining all aspects of work-relationships that has more words in it than bible. The very notion "to codify work" is aberrant - down to the silly notion that nobody should be in an office on a Saturday afternoon. (So guards have the authority to not let them in.)
I vigorously hate our labor code but you are NOT prohibited to come on Saturday because of the law. It was likely for security questions: it would be easy for a lone employee to copy sensitive files or steal expensive hardware for example. Only work on Sunday is outlawed in the majority of cases.
I could go on about the silliness of the 35-hour work week voted in by a Socialist Government in 2000 by lowering the numbers of hours worked in a week from 39.5 to 35, at the same pay-rate. The French are good workers, but unlike the Americans who think it is a "way of life".
One can argue in favor of one situation or another, but none is a silver bullet.
The US situation is wholly undesirable in my eyes (loss of family ties, prevalent poverty, pointless consumerist life, etc). As for other European countries, they achieved a high employment usually at the cost of more precarity and more poor workers. And everywhere median wages have declined, faster in the USA and other countries than in France, while the cost of essential goods was increasing (housing, energy, food). One can argue for any of those models, but mind you the French one has its pros that are too quickly dismissed in France.
Like everyone and his brother I advocate for a radical simplification, an universal contract with progressive rights, and more part-time, but I know from first hand experience that this solution is overblown, nearly not as important as many believe, and its cons understated. It will merely boost the local services. On the rest of the economy the benefit will be marginal. The best gain is that it should help the integration of the youth and disenfranchised, at the expense of others.
On a side note, the govt will eventually HAVE to intervene to decrease the weekly work time. Because the job destruction rate will continue to increase with time while the job creation rate will decrease. And the next technological disruption will smash the intellectual professions (whose numbers are already declining in favor of intermediary ones).
France has not known an unemployment rate less than 7% since the 1990s - which is more than a quarter of a century ago. And every five years (of a presidential term) the same tired faces show up to "lead the nation". And most haven't the foggiest notion of where to take it - but that's not a consideration since they are all
ENArques.
Of course you are against the énarques, like everyone else (but me). But almost all US presidents come from the Ivy League, and almost all British prime ministers come from Oxford. The reproduction of elites is the norm everywhere.
Remove the énarques and you will see Sciences Po replace it. What an improvement. Remove Sciences Po and it will be the ESSEC and HEC. This would be even worse.