OK, here's how I looked at it.
Canada's population here is largely jammed into the strip from Windsor to Quebec City, through London, Kitchener-Waterloo, Hamilton, Niagara Falls, Toronto, Kingston, Ottawa, Montreal, Trois-Rivieres and Quebec City. This strip is home to more than 60 million in 2007, with Toronto better than 10 million and Montreal close to it. The heavy industry belts stretch from London towards Woodstock, St. Thomas, Kitchener, Brantford, Hamilton and Brampton, as well as from Scarborough (east end of Toronto) out to Newtonville. We're talking LA-style development mega-sprawl development here, but with massive chunks of land saved for natural uses.
Many more of Canada's people live in the maritimes, where hardier crops and more steady fishing, as well as greater industry, have kept the economy moving there. Iron ore in Labrador and Quebec fuels Ontario steel mills. The Le Grande project provides much of the electrical power and fresh water.
Out west, Vancouver and Seattle have become similar to the US Northeast, a massive urban megatown accounting for 14 million residents between Victoria and Olympia. Vancouver has a massive Asian majority, and native Canadians are also common. Many of BC's whites live in the valleys in cities such as Kelowna, Kamloops and Trail. Edmonton is the center of the eneryg industry, while heavy mining has lured quite a few north into the Yukon and Northwest Territories despite the harsh climate.
South Africa here has a giant black majority - around 90% or so - but they were enfranchised in time for the 1948 elections. Heavy industry develops here as in OTL, with manufacturing centered on Johannesburg, Maputo, Salisbury, Windhoek, Lusaka and Anataraivo. A big ferry industry connects Madagascar with massive terminals at Maputo, Zanzibar, Durban, Beira and most of the other major cities on Mozambique and South Africa's costal cities. mining fuels the economy here, and what coal is not used in SA fuels steel mills and power plants in Britain and Australia.
India has plans to take over Malaysia and Singapore, but hasn't made good on them for obvious reasons. The two trade freely with India anyways. Oman is a source of frustration for the Indian government as the local authorities really want stricter religious laws, based on their muslim faith. The border with Yemen is also problem-prone.
Australia supports a good many people on its continent. Massive water projects and pipelines from PNG provide the water needed for agriculture. Australians were in many ways anti-immigrant and stayed that way into the 1980s, but its racist systems came down then but not without pain to go with it. The 1990s say Sydney, Melbourne, Port Moresby, Canberra and Auckland rocked repeatedly by violent race riots. However things are settling down. The whites are the biggest gropup of population but only total 27% of Australia's population.
). Seems like it had the potential of supporting a larger population, but was seen as a rather risky venture. More of a place where one would make thier money and return home, rather than putting down roots. I suppose it would require a major investment in its infrastructure.
