The northeast has two commuter lines not shown on this map, and doesn't extend as far/is less populous anyway. Here's the map with some of the commuter lines(some extend well beyond the edge of this map).Northeast is gonna riot being left out of this while North gets two lines to itself.
Slavery is normal in this world, and the plantations of Ioruba north *America and the Amurizag *Caribbean require fresh recruits. The biggest source of slaves is Europe, prisoners of war taken in Celt on German/Celt on Celt/German on Slav wars, the Turkish Khans selling off rebellious subject peoples, or the product of Jutlander slave raiding (something the *Danes have recently expanded to positively industrial scales). The Suihon/Swedish Empire does some raiding on the crumbling Slavic and Finnish edges of the Turkish empire, but it's a smaller scale - and necessarily more cautious - enterprise.
(It's about as similar to OTL Islam as OTL Islam is to Mormonism.)
I think the idea of Africans ruling over white slaves is...really questionable. There's a reason Europeans used African slaves IOTL, and it's because neither Native Americans nor Europeans could survive tropical diseases well enough to make good slaves on Caribbean or South American plantations. They tried to use white labor, oh they tried, but ultimately only African slaves could turn a profit.
How about US Olde South plantations? After all, whites did manage to settle there in numbers, even if they weren't working the cotton fields. (It is, after all, central to the original story.)
Great map, but so many questions.
Why "Hudson" instead of Keewatin?
If you kept Athabasca, why is Manitoba the same shape as OTL? And why not Assiniboia, too?
there is two 55s and your missing 60 in the notes and 36 in the map. and 38 is gone.