For up-to-date information on travel to the US, as well as current procedures, visit the websites of the US Department of State (www.travel.state.gov) and US Customs and Border Protection (www.cbp.gov). It is highly recommended that you check and confirm all entry requirements with a US consulate in your home country before leaving.
Visa information is highly subject to change. Depending on your country of origin, the rules for entering the USA keep changing. Double-check current visa requirements before coming to the USA.
For up-to-date information about entry requirements and eligibility, check the visa section of the US Department of State website (http://travel.state.gov/content/visas/en.html).