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The original was posted on /r/askhistorians by /u/urlang on 2023-07-17 20:34:35+00:00.
I couldn’t find any good resources on this. I also understand that GDP may not be accurately known for some countries.
I wonder if, for example, France was surprised by Germany’s GDP. Are there any known reactions or consequences?
On a mostly unrelated note, I remember (paraphrased) the French King saying that accurate mapping of France by astronomers had cost him more territory than a war.