Most common cause of war

The war is a great problem for every nation. It does not Bering peaces only destroy. Do u know what is the common cause of war. Many people give their different comments about war.

1.     Some body thinks that religious differences  is the common cause of war. In the past 2000 years this has probably been the number 1 cause for war. Everyone wants to say their God is the right one.

2.     Some body says that territory is the common cause of war. Before organized religion, such as Christianity and Islam and Judaism, there were people fighting for territory. The Romans did not fight because they wanted to spread their religion; they faught because they wanted more land. Alexander the Great did not fight because he wanted to spread his religion; he faught because he wanted more land. Greed for land is a big thing. I feel that religion might play a part in it, but there is always the greed for power that makes someone do what they do.

3.     Some one tells that there are a myriad of causes to wars, and certain ones often appear with higher frequencies in a given period than others. This question should really be more time-dependent because it's almost hopeless to identify a cause for war that has historically been more common than others. Some causes or inspirations for conflict can also be diluted; one could say the Romans and Alexander fought for territory and glory, not just either or, and maybe that they had other reasons as well. Often that's the case: there's rarely a single reason, but a coalescence of factors that generally accrue over time.

4.     Some gentleman tells that, people+religion =land+resources.

5.     I want to add one thing more that is Love. Love is one of the cause of war. The Tory city distorted due to Love.