U.S. Visa (unless you´re from a visa waiver program country)

Roud-trip ticket or proof of onward travel

proof of sufficient funds (bank statements or credit card)

be honest with immigration officers

answer clearly and truthfully

never carry false documents: this can lead to imediate deportation.

avoid saying you plan to stay longer

than allowed, especially if yo´re entering as a tourist,

do not bring prohibited items (e.g. fresh food , certain plants,weapons)

declare if you over $10,000 usd (in cash or vañuables),