10 countries where getting citizenship is difficult for Nigerians, others

For millions of people around the world, obtaining citizenship in a second country can provide greater security, mobility and long-term opportunities.
While many countries have established routes for foreign residents to become citizens, others impose lengthy residency periods, strict language and integration requirements, limited eligibility or highly discretionary approval processes.
In some cases, simply meeting the legal requirements does not guarantee success. Authorities may retain broad powers over who can ultimately be granted citizenship, while countries such as Japan and China also place restrictions on dual nationality.
Here are 10 countries where obtaining citizenship ...