In 2008, the largest group of newly legalized permanent residents was from Mexico. Other countries with high immigrant numbers include China, India and the Philippines.
California is the most popular state of residency for U.S. immigrants. Other popular states include New York, Florida, Texas, New Jersey and Illinois.
The United States gives priorities to potential immigrants in certain fields, including those in priority industries, professionals with degrees or special skills, workers who will create jobs and workers moving for religion work or government positions.
A legal permanent resident of the United States has a "green card" but is not a citizen of the United States.
To become a citizen, a legal resident must be at least 18 years old, be a permanent resident for at least five years and meet other requirements.