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All laptops that I have used in the past 10 years have had auto-sensing power supplies that will operate from 110-250 volts and 50-60Hz.
Look at the power supply of your laptop and read the rated input voltage that will be printed on it. A Power Supply from an IBM Thinkpad I have head reads:
INPUT: 100-240V ~ 1.2A-0.5A 50/60Hz
If your power supply reads a similar input voltage range, it is ok to use in the USA and all you need is a plug adapter to match the USA physical socket. These can be purchased from mpost electronic stores (eg Tandy, **** Smith), electrical appliance stores (eg Harvey Norman) or at the airport.
My IBM ThinkPad power supply has a removable mains power cord, and I now carry two cords, one with Aussie 3-pin connector and one with USA connector. I also carry a bag full of different adapters so I can make one of my power cords fit any power socket I have found in the countries I visit.
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