Why would France have a lower population than otl? shouldn't it be quite a bit large since a whole generation of young men isn't killed off? and IMO the uk should have a larger population aswell, seeing as those men who died would have children themselves and less people would emigrateUK: Ireland: 7 milion people. Scotland: 9 milions. Wales: 5 milion. England: 55 milion people. Immigrants would be about 8% of the population, with more people from the Commonwealth and less eastern and southern Europeans.
Metropolitan France: 55 milion people
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France wouldn't have had such a large post war baby boom and wouldn't have Alsace and Lorraine. The birth rate in France actually went up after the world wars, in 1914 France had the lowest birth rate in the world.
The UK could have a larger population but would max out at about 80 mil imo, which isn't far off from my prediction if you include Ireland. Also what really matters is the distribution of the population, London would have about 12 million people and Birmingham probably wouldn't have been purposefully killed by the government as in OTL.