Citizenship rules vary wildly across the world, shaped by history, economics, and politics rather than fairness or consistency.

Add Yahoo as a preferred source to see more of our stories on Google. Having multiple passports can be an escape route in troubled times, say experts. - Dmytro Chernykov/iStockphoto/Getty Images ...

Traveling from country to country without restrictions. Shorter lines at the border. The right to live and work in your dream destination, or to reconnect with family roots. All that, and more, is the ...