 As of 2012, the Bangladesh government estimated about 500,000 illegal Burmese immigrants living across Bangladesh.Immigration in Bhutan by Nepalese settlers (Lhotshampa) began slowly towards the end of the 19th century.The government passed the Bhutanese Citizenship Act 1985 to clarify and try to enforce the Bhutanese Citizenship Act 1958 to control the flood of illegal immigration.