This article is a The is not the easiest country to try to enter, even for US citizens. The events of 9/11 have made entry more difficult than it was.
For most purposes other then pleasure, most travelers will need to apply for a visa. However even a visa itself does not guarantee that the bearer will be allowed to enter the US. This article intends to take you through the ins and outs of what one needs to do to try to enter the US. It aims to give general guidance such as when one needs a visa or when one can travel without one.