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Are there some basic patterns in flags that occur over and over again?

Who decides what each new flag should look like?

 

The original US flag had 13 stars arranged in a circle, along with 13 stripes. In 1795, when Kentucky and Vermont were added to the original 13 US states, the flag featured 15 stars and 15 stripes. When more states were added, however, the designers returned to 13 stripes. Why do you think this happened?
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