It is generally true that the past is the best guide to the future that we have but that is not to say that it is always a good guide. Does anybody seriously think that (say) America of 100 years ago is the same as the America of today?

Yet by far the commonest argument coming from the Left about immigration in general and about Muslim immigrants in particular is precisely that America of today IS just like the America of 100 years ago. You can read the latest such article in the NYT (by Kristof). It is an argument so hackneyed by now that he could almost have written it in his sleep. Maybe he did.

The argument is that the Irish, Italians and others who came to America in the 19th century were viewed with grave suspicion by many and suffered from discrimination but in the end blended in seamlessly with Americans of other ancestries: The melting pot.

From that Kristoff and others conclude that Muslims will eventually “melt” into a homogeneous American population also. And perhaps many will. But there are two crucial difference that will at least greatly hinder full integration:

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