U-boats relate to both World War One and its aftermath because it occurs at World war I.
How do U-boats relate to World War I?
The U-boats refer to the blockade across the North Sea by Britain and cut the flow of war supplies, food, and fuel to Germany during World War I. In response, Germany retaliated and destroy neutral ships that were supplying the Allies.
So we can conclude that U-boats relate to both World War One and its aftermath because it occurs at World war I.
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