Many individuals were born outside the US and may never have lived and work in the US. Yet they are obliged to file an annual US tax return. For many people, no actual US taxes will be due as they can make use of foreign income exemptions and tax credits. Nevertheless, they may want to get rid of this annual administrative burden and decide to give up their US nationality. A visit to this specific website will answer most of their questions.
http://renunciationguide.com/Renunciation-Process-Step-By-Step.html