I could be wrong, but it is my understanding that it was a deliberate policy of the French government after WW2 to invite them in. It is also natural that French-speaking people of the world would prefer to migrate to France.
But if French governments wanted to limit migration from Algeria or elsewhere, they could have done so. It was certainly not an inevitable consequence of colonialism.
They were brought in as guest workers. French governments tried to restrict or revert immigration a few times (in the seventies I think) but it did not work.
And now, in Brest, deep down (or west) into Breton (Celt) territory, we have a radical Sunni mosque. And woke Americans lecturing me about it's supposedly a great thing.
