To be honest, if you can. I would keep the account open - you never know when you might need it in the future.
I'm British but lived in the US on a student visa in 2008 - I opened a bank account there and have kept it open ever since (using my aunt's US address), though I don't plan to live in the US again.
It's really useful for when I visit the US as I can transfer money to it and also receive things like US PayPal payments. Plus, having both US and UK credit cards is great for things like iTunes and online payments where a US address/bank account is required.
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