Jaberwok
The two world wars. 1914 and 1939 were caused by both the Kaiser and Hitler Empire building , not scarce resources. Sounds familliar??!
I don't think that in either case it was as simple as that
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All of the European powers (including the UK) had empires, and were carving up the world between them, in order to take as many of their resources as they could. That, coupled with the spread of Nationalism, such as we are seeing now, and animosity between neighbouring states were arguably the main causes of WW1.
Hitler gained power after years of Germany being forced to pay reparations after WW1, resulting in economic collapse and poverty for the masses, plus a well-oiled propaganda machine which was able to persuade a majority to scapegoat the Jews and others who did not conform to the Aryan ideal, vote him in and follow his murderous philosphy.
Propaganda, scapegoating, Nationalism, competition for resources (scarce or plentiful), 'charismatic' leaders, an impending recession, the crushing of resistance - now that sounds worryingly familiar.