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Switzerland, norway, and iceland
They grew crops, and started expanding, turning more colonies around into bigger ones, to eventually create the whole 13. They were still under persecution from England, so eventually, they decided to come together and form their own government, and write the constitution.
Well one relationship would be Hitler fought in both of them for one. They differ because Hitler was a General In WW2 and he was a soldier in WW1. Umm... In WW2, thousands of prisoners were killed in camps, and in WW1 there was not.
(I am pretty sure, I am going off of memory here)
They were also fought differently because there were two different presidents during both wars.
In WW2 was the first base we had ever had bombed, ever in WW1 we didn’t.
There are some similarities and differences there. Hope this helps?