An immigrant can apply for a green card if they wish to work and live in the US as permanent residents. They, however, continue to be the citizens of the country to which they originally belong. There is a huge difference in the responsibilities, rights, and privileges of a green card holder and that of a US citizen.
US citizenship is the highest status that is accorded to an applicant under the US immigration law. It allows them the right to live permanently with family and friends in the country. But