there are no specific documents you can present, typically people don't present any
you do have to indicate where you will be staying and the CBP officer will ask you questions regarding the purpose of your trip. If they suspect something, they will ask you more questions and secondary inspection is always a possibility
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Evidence of the purpose of the trip. Not having a return ticket is likely to be a red flag.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.
The customs officer will ask you certain questions, stamp your passport, and give you the I-94 counter slip. You are legally allowed to stay in the U.S. till the date printed on your I-94 and the date printed on the visa.
Under the US-VISIT program system, the Immigration Officer will click your digital photo and take your digital fingerprint. You should expect questions related to your length of stay and your place of residence. You may be asked questions such as "Why you want to stay in U.S. for 3 months? Or why do you want to stay for 6 months?
When answering questions the best policy is to answer truthfully. Finally, in addition to the documents mentioned in this thread it’s always advisable to have a hotel reservation, car rental, itinerary of your trip, or the address and contact info of the family/friend’s that you intent to visit.