Although the legalization of undocumented immigrants is a very difficult process, and on many occasions an 
impossible one, the truth is that there are several roads to achieve it.
Important to take into account
-There are waivers, which in some cases are exceptional measures that are applied to some immigrants. Certain requirement apply at the moment of requesting them.
– In some cases, people who are legally in the U.S. or who have never been in the country may not obtain the Green Card.
-When speaking of the Green Cardor the residency card we are, actually, speaking of the same thing: the right to live and work in the United States.
-Before starting any migratory process, it is advisable to seek professionalcounsel from a lawyer.
Roads to legalization
There are several roads through which the residency may be requested, such as:
-Family
-Being a victim of violence or human trafficking
-Being a Young migrant in a special situation
-Politicalassylum
-Having lived in the U.S. for many years
– Being an immediate relative of a citizen serving military service
Semi legality
-DACA or Deferred Action for Dreamers.