*15 points* describe the characteristics of a commonwealth.

The Commonwealth had no charter until 2013 and membership is entirely voluntary. And of nations eligible to join, very few chose not to do so. This distinguishing characteristic has been of considerable historic importance: when countries had recently achieved their independence from the UK, it was important for them to stress the change in their relationship, from dependent status to equal partnership.  

Explanation:

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the climate of each region is different from one another.