The Skynet kind.

Can't have a discussion without some sort of pop culture reference:

German Tour Guide: You vill find more on Germany's contributions to ze arts in ze pamphlets ve have provided.

Brian : Yeah, about your pamphlet... uh, I'm not seeing anything about German history between 1939 and 1945. There's just a big gap.

Tour guide: Everyone vas on vacation. On your left is Munich's first city hall, erected in 15...

Brian : Wait, what are you talking about? Germany invaded Poland in 1939 and...

Tour Guide: We were invited. Punch vas served. Check vit Poland.

Brian : You can't just ignore those years. Thomas Mann fled to America because of Nazism's stranglehold on Germany.

Tour guide: Nope, nope. He left to manage a Dairy Queen.

Brian : A Dairy Queen? That's preposterous.

Tour guide: I vill hear no more insinuations about the German people. Nothing bad happened. Sie werden sich hinsetzen. Sie werden ruhig sein. Sie werden nicht beleidigen Deutschland. You will sit down. You will shut up. You will not insult Germany. (Throws his hand up in a Hitler salute.)

How to Lie with Statistics, Darren Huff, 1954

I remember hearing about this in 20th Century History. It's been about 5 years, but if I remember correctly, the professor suggested that the switch from strategic targets to civilian targets allowed British factories to continue to produce materials necessary for warfare/defense. For example, I believe he gave the example of a simple ball bearing factory being critical to Britain. Had the Germans continued to bomb strategic targets such as this factory, the British would have been unable to produce parts necessary to repair or produce new RAF planes.