The reason why people want to live in US is because this country offers freedom and better life opportunity. The problem is that some of those people are not taking the legal step to visit US. The story get different if those people are in US in business trip which means that they could be using the investor visas. This kind of visa is issued for those who visit other countries in business purpose, but if US Immigration finds out there is visa violation, they have the right to deport them. What about student visa? Student visa is used by students from other countries who choose to finish or continue their study in US.
Each visa application depends on the purpose of the resident permit. For example, we all know that the investor visas are intended for businessmen or whoever who have business oriented in US. The student visa is for those who study in US whether they are high-school students, colleges, or universities students. In case the visa holders are encountering problems, they have the right to get help from immigration lawyer in Los Angeles if they live in city of angels. The common problem is they exceed the resident permit which considered being the visa violation.
What if you want to get green card and to get US citizenship? It is not easy to get green card and around millions of immigrants who are living in US, only few of them get the chance to have green card and turn their citizenship into American. You can get the complete info at www.uscis.gov where you might get the chance to know what requirements you need to apply visa to visit US. Whether you visit US for business, pleasure, or education, make sure that you use the legal way to get your resident permit because since the 9/11 attack, US government has been putting the visa application stricter than before.