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Most often, you write according to your background. If you are American, you write using American English and if you are British, you use Brit. This is usually applicable for novels and other long ...
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Source: https://writers.stackexchange.com/a/3656 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Most often, you write according to your background. If you are American, you write using American English and if you are British, you use Brit. This is usually applicable for novels and other long material. This was the method used by old writers like Mark Twain and Charles Dickens. If you book is really popular your publisher may make conversions to make it more readable in a particular area. If you are writing for a magazine or similar source which would be marketed in a particular area say the US, then it would make sense to target the English spoken in the target area. Hope it helps.