That's a really difficult question to answer, but it probably would be because one group of countries is no longer willing to tolerate the shortcomings of another and their feud would spill outside borders and trigger a world war.
Of course there is also the philosophy that we are already fighting world war III and the cause is terrorism triggered by the fall of the World Trade Centers. If one thinks about it, there are very few countries currently at peace with the world. Almost everyone is fighting with someone somewhere currently. In these cases and in the case of most wars, philosophical differences lead countries to find excuses to fight with each other.
Just my 2 cents
Stupidity, ignorance, venality. By both the politicians and their subjects. That is the answer to all questions of relationship, whether personal or political.
World War III will likely occur as the result of either a global shortage of resources (i.e. oil) or through fanatical behavior and actions that will sort the countries of the world on one side of the aisle or the other. It will not be the existence of the fanaticism but the end that it comes to. For example, let's say Iran explodes a nuclear weapon within the borders of Saudi Arabia and then threatens to carry out the same act in France. The act combined with the continued threat could set the wheels in motion for a counter attack on Iran. Countries would find themselves aligning with either faction and electing to enter the fray much in the same way as it occurred in WWII. Once that happens, then it is a matter escalation of events. War is much the same as it has always been, it's the weapons that have changed and thus changed the tactics of war.
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