The dollar is one of the world's most stable currencies and is the only currency accepted in the US. If you're traveling to the states, you'll have no problem using your credit card. Banks are common and ATMs are inside most corner stores as well.
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The general consensus is that you should have $50 to $100 in cash per day for each traveler. However, this amount could vary considerably depending on where you are vacationing. Some destinations are more cash-friendly than others.
Make a Budget for Your TripAs a rough estimation, budget $50-100 per person for each day that you will be away. This should cover your accommodation, food, drink and transportation costs. Of course, this number can vary according to the destination and your style of traveling.