Our world today is faced with many major threats。 The most dangerous threat of all is war。 Each war starts for a particular reason， but there are a number of steps countries can take to prevent its outbreak。

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On main reason for war is the difference in ideology。 In order to control the world， capitalist countries never stop trying to tam over the communist governments。 Land ownership is also a reason that countries declare wars on their neighbors。 For example， if oil is found on the land in one country， that land may be claimed by another country， for historical reasons， and the latter is likely to declare war in order to recover the land containing oil。

To prevent the mutual slaughter of human beings， countries shouldtry to solve their differences through international organizations such as the United Nations or by other peaceful means。 In addition， the world people should never stop condemning those warmongers and send them to their graves if they dare launch new wars。