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These data from the WHO Diamond study of insulin-dependent diabetes mellitus among children.  There are also some examples:

Nationality               Incidence   per    100 000  children

                                        Source                                   Migrant

British Islands         14-20 (Several places)              13(Canada)

Indian                        7-33 (Several areas)                  9 (Canada)

Puerto Rico                   10 (Puerto Rico)                  14 (Philadelphia)

It seem migration has a big effect. But we need just a few studies to suggest it.