A Green Card provides many advantages. Primarily, it gives you the right to permanently live and work in the United States and after 5 years, to become a U.S. citizen. With a Green Card, you can also exercise almost all of the same rights that a U.S. citizen has without having to give up your current citizenship and you can also travel freely between the countries. Also, Green Card holders can sponsor their immediate family members to live in the United States. By the USCIS’s definition, immediate family members are spouses and unmarried children under the age of 21.