alternatehistory.com

So due to timeline shenanigans the world experiences a period of peace in the mid 20th century to the early 21st century. The POD is way before 1900 although the scenario stretches from the mid 21st century to the early 21st century. All major nations present a minimal threat of military attack on each other and compete economically rather than militarily.

The nations of the world are divided into blocks that generally coexist with each other, each of which is dominated by a power. There are a couple of small conflicts between insurgent groups for a decade or two but the great powers work together to crush them successfully.

How long would it take for the nations of this world to atrophy? How fast would they atrophy and to what extent? How badly would they be weakened? How fast would the nations be able to rearm?

Perhaps a nation might have its military shrink by 50% in roughly 100 years?
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