Documents needed to travel from Mexico to Japan in transit via Dallas Airport

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I have to travel from Mexico to Japan with a layover in the US. I will take an plane from Mexico City to Dallas, and after 4 hours, I have a flight to Tokyo. What do I need to present to US immigration when entering the US from Mexico, besides my US visa and my Mexican passport?
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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Andrea Piacquadio, Andrea Piacquadio, Andrea Piacquadio, Gustavo Fring