First, the plurality of illegal immigrants in the US are people who entered the country legally but have overstayed their visas. There's not a lot of sneaking into a different person's country to do work.
Second, there is no "legal line" for immigration. The closest you get is that some visas where conversion to a permanent residency (green card) has an annual quota that is so heavily oversubscribed that there is a permanent backlog which stretches, in the most extreme cases, to over 20 years long.
Third, even when you're dealing with the legal immigration processes, that process is a bureaucratic hell that I don't wish on anybody. If you don't have anybody willing to descend into paperwork hell for you, then there is no way for you to immigrate to the US.
Second, there is no "legal line" for immigration. The closest you get is that some visas where conversion to a permanent residency (green card) has an annual quota that is so heavily oversubscribed that there is a permanent backlog which stretches, in the most extreme cases, to over 20 years long.
Third, even when you're dealing with the legal immigration processes, that process is a bureaucratic hell that I don't wish on anybody. If you don't have anybody willing to descend into paperwork hell for you, then there is no way for you to immigrate to the US.