I pretty much just spammed researched/produced whatever my advisors told me to get without looking at it.
I suppose on higher difficulties that's not very effective!
Also I saved the Germans for last, but when I got there they were all still in the middle ages, while I had fighter helicopters, so it was a sadly pathetic climax. Steamrolled their whole nation in 3 turns.
I'm sure me having 7 cities before I even invaded a nation for the first time factored in. By the end I had maybe 20.
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