When it comes to using an international credit card in the U.S., it's important to know that Visa and Mastercard credit cards are widely accepted. In other words, if an establishment takes credit cards, it's a good bet that your international Visa or Mastercard will work.
Chip-and-PIN credit cards are not as common in the U.S., however, if you're planning to travel in Canada or Europe, you should probably have a Chip-and-PIN credit card. Although many payment terminals accept Chip-and-Signature, in some cases you might need a PIN card, like at unattended kiosks and train ticket machines.
Lastly, some places don't take credit cards, or your cards might get rejected. In such cases, having some U.S. dollars can be a lifesaver.
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