AHC the UK with 100 million people by 2000

In 1900 Japan had a population of 43.8 million compared to the UK with 39.8 million. By 2000 Japan had 127 million to the UK's 58.5 million.

Both countries are islands of similar size (Japan is larger but with less arable land) how could we have seen a UK that kept more pace with Japan?
 
the UK keeps its empire together, perhaps by going towards imperial federation. tada, you would easily have this done. The tricky part is just keeping its empire together, this includes India.
 
the UK keeps its empire together, perhaps by going towards imperial federation. tada, you would easily have this done. The tricky part is just keeping its empire together, this includes India.

You wouldn't need India. Getting Canada, Australia, and New Zealand would be enough.
 
It’s almost kind of remarkable the UK had as little growth as it did OTL, given the amount of immigration they received since the Post War era and the increases in life expectancy. The UK already had a fertility rate that was well below Japan and barely above the replacement rate before WWI.

Maybe have the UK lose WWI and fight an indecisive defensive war 20 years later against the Central Powers by themselves. As a result they develop a siege mentality and make the similar efforts to those seen in OTL Israel to keep fertility up, with significant and aggressive appeals to religion, ethno-nationalism, and use of government subsidies to keep the fertility rate positive so they can keep up with the larger Germany by themselves.

Or open their borders more aggressively.

Or just have a more natalist society in general for other reason.
 
You'd have to have a mix of cultural norms and public policy that made procreation a fixture of national expectation, along with a drastic intake and assimilation of (to maintain the gains and expound upon them) new immigrants.

A good example of this would be Israel, who have very high fertility rates in its secular population and absurdly high fertility rates amongst its Haredim and Arab populations.

Britain to a lesser extent had this with Catholics, but it needs a lot more of a natalist view to hold sway in other parts of society to get there.
 

WILDGEESE

Gone Fishin'
Ref: Populstat

1800

GB: 10 million
Eire : 5.2 million

1900

GB : 36.5 million
Eire : 4.4 million

Keep Ireland part of the UK and have no Potato Famine and Irish Emigration you could end up with 81 million by 1980.

Plus have little GB emigration between 1830 to 1930 (4.5 million emigrated to Aus, Canada, NZ &USA) you could get another 12 million plus with natural growth to around 96 plus million.

Don't know if that helps.
 
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