Countries That Don't Allow Dual Citizenship

What countries do not allow dual citizenship, requiring you to renounce your current nationality if you naturalize, and how does this impact people seeking to build a passport portfolio?

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BEST PASSPORTS IN EACH CONTINENT: https://www.youtube.com/watch?v=XlWP4CpZXRQ

In this video we talk about what countries in Europe and Asia specifically do not allow dual nationality.

00:00 Intro
00:12 Estonia
01:10 Austria
01:56 Spain
03:36 Singapore & Japan
04:13 Mongolia
04:30 Bhutan
05:17 Brunei
06:17 Outro

On this channel we talk about:
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