I received a B1/B2 visa to US (in a country different from my nationality)
Is the visa all I need, or do I need to show any other documents at the departing airport and/or the entry airport at the US?
Airlines / immigration will check a few things:
- your passport should have several spare pages, and at least 6 months' validity into the future (although that probably got checked when you got your visa, make sure it's still accurate)
- you should have a return ticket, or evidence of a planned departure from the US (eg bus ticket out, or onward flight)
- evidence of where you'll be staying (itinerary, accommodation bookings, if any)
- funds for travel - not always asked for, but sometimes they'll want to know how you'll support yourself, especially if you're there for more than a few days.
Given you received it from a country other than your nationality(?), it's best to bring any visas for that other country you hold, if they're in a previous passport or similar (it happens sometimes).
Pretty much any question you had to answer as evidence to get the visa may come up again, so be prepared to provide evidence for those once more, as well as the above-mentioned items.