Well, I doubt Hitler would have changed anything. The vast majority of wars throughout history, including the mid-20th-century imperialism of Germany and Japan, are about LAND and therefore MONEY and therefore POWER of the ruling regimes. LAND gets you MONEY if the LAND has RESOURCES - either natural or human, particularly natural such as oil, timber, fertile farmland, iron ore, other minerals, etc. Europe to Germany is much easier to conquer, due to its proximity to Germany, easier to defend, due to Europe being surrounded by water and mountain ranges for the most part, and much richer in resources, both natural and human, than the middle east. Yes the middle east has oil to be sure (some parts of it have oil anyway), but you can rest assured that Hitler and Hirohito made their decisions on what to conquer FIRST based on what was in their best interests overall, in terms of resources, ability to protect the conquered lands, and usefulness as a stepping stone to future conquest. You can bet that Iraq would have fallen before Poland if its resources had been higher overall. Doubt it would have anything to do with terrorism, had that occurred. Now it's doubtless that Hitler WOULD HAVE, if allowed to, gone on to conquer the entire world (if we would have let him), or at least divi'ed it up between him and Japan (they met and discussed as much, Hitler and Hirohito or whatever the Emporer's name was). Now, would the middle east have been the NEXT to fall had the Allies stood idly by? Yes, the USSR with its very large hydrocarbon and other natural resources and the middle east would have been the next targets. USSR was in fact the next target of invasion once the continental European mainland was shored up, including scandinavia. Had that succeeded - had the Germans not been defeated on the eastern front, doubtless Hitler's next move would have been to march on into the middle east to conquer the vast oil resources. But USSR made much sense both geographically and resource-wise. Great Britain made much sense as a dangerously close staging point for enemy invasion, which as it turns out, was in fact Germany's main downfall, with the invasion causing him to fight on two fronts, leading to defeat on both. Hitler should probably have conquered GB first, and only then moved on to Russia. But Japan pissed in his soup by bombing the US and waking us up, and he underestimated how hard it would be to fight those tenacious Russians, esp. in the winter. I forget when exactly Hitler invaded Russia, but it was before the allied invasion. Had Hitler invaded and conquered GB first, and only then moved on to USSR, the third reich might be in charge of the world right now. But I suppose he was tempted by the vast oil and other resources of USSR - I'm not sure - I'm not that great a student of history.
Our war on terror (so-called) is the exception to the rule of wars being fought for money/land/power/conquest. Remember, one man's "terrorist" is always the other man's "freedom fighter."