Why doesn't my spell checker recognise American states?

I've just noticed something weird. On my Samsung phone as I type it suggests words along the bottom as I begin to type and will correct my spelling as I go along.

But for some reason, it doesn't like American states. For example California isn't recognised, Texas automatically gets changed to "texts". Arizona becomes Arianna. Louisiana became "Louise anal". Even if a state is recognised, it won't automatically capitalise it as it does towns and cities.
Why doesn't my spell checker recognise American states?
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