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I was under the impression we did that for exactly this case in America but when I searched I found a page saying we only issue two passports in extraordinary circumstances. This might count though.

Chris Guillebeau had two American passports for precisely this purpose. Also, you have to send your actual passport to get some visas and that leaves you without a passport for weeks at a time. So having two helps there too.

Canada won't do this. I had my passport stuck with the UK's Home Office for six months and the Canadian High Commission said they couldn't issue me a second travel document.

In Taiwan, “I need to get visas from multiple countries at once” is a valid excuse to get a second passport valid for 5 years.

:)