Immigration to the US has been growing very fast since many years ago, but today, this phenomenon is bigger. Many people leave their countries to come to the US and try to find a job, make some money and then go back to their country. Nevertheless, others decide to stay in the US living their "American Dream". People come to the US thinking that they are going to be safe and find a good job; they also come escaping from wars, political corruption in their countries and many other causes.
This situation has produced many problems to the US government, and the main of them is illegal immigration. Thousands of immigrants come every day to the US looking for their "gold opportunity", but they do not do things well. Why is that so? Because they come in an illegal way, and they usually have to be running away from the police.
However, others do everything according to the law; they acquire their residence (green card) and can stay as legal residents. Actually, there are many ways to apply for being a legal resident; one of them is the Annual Green Card Lottery, which provides 50,000 visas and allows the person who wins it to live and work legally in the US.
Illegal immigration is a crime, and if you conceal an illegal immigrant you are an accomplice of the crime. If you know somebody that is illegal in the US, denounce him/her. If you want to help illegal immigrants stay in the US, encourage them to find a good lawyer who can assist them get the residence.