This doesn't apply to people who, for whatever reason, did not seek out the nonimmigrant visa - despite the fact that they were given amnesty in 2007 prior to the reset.
Also, for that matter, current law only applies to undocumented immigrants who have been in the country prior to 2004, as none who arrived after that point could have ever been in the "U.S." illegally.
US-Atlasian Origination Confusion: Now with a vengeance post reset.
There is a great deal of confusion regarding the shift from US To Atlasia, pre-reset. Partly because the game started out as a gov't for the members of Atlas, as opposed to a government of a distinct fictional universe that is a part of, but not inclusive of the whole Atlas community.
The Reset adds to the mess because we reset everything to US Status quo of 2016. So in essence this acts like the 2004 switch over never happened and that everything up until 2016 that happened to the US legislatively and legally speaking would have still applied. So from a legal standpoint, the US would have indeed existed in 2007 even though the game still dates back to 2004.
I guess it could be considered a retcon of the US back into existence for that period.