Getting citizenship anywhere in the world involves paperwork, background checks, and years of patience. But in some countries, the process is not just rigorous, it is so restrictive that getting through them will need someone to have iron-like patience. They have in place rigid rules like decades-long residency requirements, bans on dual nationality, and discretionary approvals. If you are keen to know more, here are 10 countries where getting citizenship is among the hardest in the world, along with the reasons why.