In the previous articles, I presented information about how to get a green card, citizenship, and how to get naturalized but what do these words mean? In this article by a legal organization http://www.nolo.com/legal-encyclopedia/difference-between-us-green-card-us-citizenship.html  I present a page that shows us differences between the green card and a U.S. citizen status. Although the green card may allow a worker to stay in the United States, it doesn't allow the person all the rights that a citizen has like voting and being able to leave the country for long periods of time. In the same page we find out that the process of a green card holder to become an United States citizen is called naturalization. We are not provided with a lot of information but if you want to dig a little deeper then you can check here http://teacher.scholastic.com/activities/government/civics4.htm . It's interesting that the person that wants to get his papers must stay in the country for 5 years. That requirement must be really hard for someone that had left family in their home country.