actually, it's a valid question - was aladdin even black? i saw the disney film when i was a kid, but i wouldn't look to disney to get this right. wiki suggests that...

Aladdin is an impoverished young ne'er-do-well, dwelling in "one of the cities of China".

that might suggest that aladdin would have been some mix of iranic and turkic, similar to a contemporary uighur around the xinjiang area, and consequently probably actually pretty white. i guess disney got it right after all.

the arabs proper appear to have migrated originally from ethiopia, so the initial muslim invasions in the 7th century (and they weren't migrations. they were invasions.) would have been directed by pretty dark skinned people, and that is upheld via both pictorial and descriptive historical data. i'm not going to find an exact quote, but it's well understood by the historians of the time that the arabs were very, very dark-skinned, if not flat out african. but, contrary to the popular palestinian origins myth, the middle east at the time was overwhelmingly white, after years of inflows from persians, greeks and romans. there would have been very little migration from what was then the roman and persian empires into the arabian peninsula, although this increased dramatically after the muslim conquests, which is why you see so many white arabs nowadays, and particularly so many upper class white arabs - they're really mostly persian, genetically. you only really see black arabs in the southernmost parts of the peninsula, and on the far western coast of africa (for different reasons). the arabs proper were a very small group, so the migrations that revisionists want to talk about largely didn't even happen at all - it was more of a process of mass conversion.

i guess it's not surprising that trudeau would get something like that completely wrong, but i don't think it really changes the situation, much.