People get angry at those who use the term "undocumented" because they are trying to avoid any term that acknowledges that they broke the LAW.
Every country in the world has immigration laws.
Every country enforces them.
Period.
FYI, they are not undocumented and they are not immigrants.
They are ILLEGAL ALIENS.
You have 2 legal categories of "aliens": Resident and non-resident Alien.
Definition of Resident Alien
Resident aliens generally are taxed on their worldwide income, similar to U.S. citizens.
To be classified as a resident alien, the individual must meet one of two tests:
1. Green Card Test
A non-resident alien is a lawful permanent resident of the U.S. at any time if they have been given the privilege, according to the immigration laws, of residing permanently as an immigrant. This status usually exists if the Bureau of Citizenship and Immigration Services has issued a green card.
2. Substantial Presence Test
A non-resident alien is classified as a resident alien for tax purposes if they were physically present in the U.S. for 31 days during the current year and 183 days during a three-year period that includes the current year and the two years immediately before that.
Definition of Non-resident Alien
If a person does not meet either the Green Card or Substantial Presence Test, then that person is classified as a non-resident alien.
A new arrival on a J-1 or F-1 visa is generally a non-resident alien.
Non-resident aliens are taxed only on their income from sources within the U.S. and on certain income connected with the conduct of a trade or business in the U.S.
And then you have An ILLEGAL ALIEN, which is neither of these.
An illegal alien is in a category all by himself or herself. He or she is not a resident or non-resident alien, not a citizen, naturalized citizen, and not any type of legal immigrant.
People like to use the term "undocumented" as if the only thing an illegal alien is lacking is paperwork, once they get it, everything will be "hunky dory". But the only way this will happen is for them to LEAVE the country, return to their country of origin and apply the legal way, obviously getting in line behind those already in the process. They are in no way shape or form "undocumented immigrants". They are not in the process AT ALL.
People like to call illegal aliens "immigrants" so as to try to make them seem "legal or kosher" and group them with those that follow the law coming here, or residing here. It's a slap in the face and an insult to group them together with law-abiding immigrants. People also attempt to confuse the issue (intentionally) by using the term "immigrants" when they really mean those that are here illegally. It is merely an attempt to blur the issue between REAL immigrants that followed the law to come here and those that did not...the ILLEGAL type.