Well that's a significant increase from a total of 80 million in the US and Canada combined in 1900 in OTL. What does TTL Canadian prairies and arctic look like? To what extent are the British exploring their arctic holdings and extracting resources therefrom? Speaking of the arctic, what does Antarctica look like in TTL?1. Thanks!
2. Because King Leopold II (say what you will about him) never "purchased" the Kongo, Africa doesn't see as much European colonization as IOTL. The Sahel, Central Africa and the Horn of Africa are largely independent. East Africa definitely has European influence, but direct colonization isn't likely ITTL.
3. The Commonwealth's population is already around 100 Million by 1900, due to OTL's Canada seeing much more settlement from the British than it did from the French. As for the welfare systems, I really have no clue how it'd look by 1900.