Thanks for the feedback, I have thought about neighbouring nations, but obviously that would be a massive task considering the US alone is 25,000 lines of HTML, so I've been wondering what countries would people want, so I don't mess it up and waste time on something people don't want.
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I don't think any country has a system that works like the US, so expanding into another country will likely be a big commitment. But if you do, you could give Australia, the UK, or one of the UK's constituent countries a try (I'd enjoy seeing that). Another suggestion could be trying individual US state elections.