Then there is not yet mentioned part of the visas - L-1 Intracompany Transferees, this touches mainly management. If one has been outside the USA as a manager, executive or a person with specialized knowledge he gets L-1A and L-1B visas. But still there are differences in this as well. The immigration law clearly states that the company into which you are transferring cannot be fully American one, it must be a subsidiary, joint-venture branch or affiliate of the non-U.S. company! The last type of temporary visa is R-1 visas, meaning for religious workers. To qualify for this type of visas you must be a member of a religious denomination for at least 2 years and have a religious job offered in the USA. These temporary visa categories include: temporary trainees H-3, persons of extraordinary ability in the arts, sciences, education, business or sports and athletes and entertainers.

So even America is strict when issuing visas, their behavior is not as negative as most of foreigners think. The American immigration law takes care firstly of economic / traders and businessmen visas /, education / lot of exchange possibilities and work opportunities for highly skilled professionals /, religion etc. This is all pretty interesting but the most challenging way how to obtain visas is to win a Green Card Lottery.

 3, nonimmigrant and immigrant visas
Nonimmigrant visas: means temporary visas, when foreign nationals enter the USA temporarily as tourist, business visitors, students, workers and many other people that are coming to the USA not forever but for a small period of time. Usually are issued at US embassies and consulates abroad. This is rather difficult because a person working at embassy must be convicted that after allowed period of time every foreigner will return back home and will not remain in the USA illegally. One thing that is rather strange is that after you obtain visas for a certain period of time and certain number of entries, it is not sure that you will get to the USA. The final decision is made by working officer at US port. Usually he allows entrance, so do not be scared. But this point should be changed in the immigration law of the USA. It does not make any sense.
GREEN CARD: this is a registration that allows alien to work and live in the USA basically-said “forever”. An alien must spend four years and nine months in the USA and then he can become US citizen. There is lottery taken every year and the winner of such lottery can become a legal US citizen a holder of green card.