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I'm pretty sure something like this isn't *decided* per se. People use different genders for words based on region, etc. Eventually one becomes the standard.
In Germany people have been arguing over the gender of Nutella for quite a while 
(It's das Nutella btw, not die 
)
Wait I thought German was neuter for inanimate objects? I though that's where English got it from o_O
Definitely not that clear, unfortunately. It's die Zahnpasta (toothpaste), but das Mädchen (girl) for example 
This makes me feel very differently about das boot
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