I do not think so and AFAIK only the export of strong encryption is prohibited by law in the US. But it is not about prohibiting encryption but the possibility

I do not think so and AFAIK only the export of strong encryption is prohibited by law in the US. But it is not about prohibiting encryption but the possibility and/or necessity that Apple has another key to decrypt your data with. It does not matter where they keep the data as long as the companies headquarters are on US soil.