The PSU (blocky thing) on your laptop's power cord can handle the electricity from either country's socket, you only need a plug with the right shape. Your best option is just to buy the US version of the second cord that comes out of the PSU and goes to the wall. Cheaper and more convenient than a converter.
Here's an example of what I'm talking about (though check your cord and make sure it's the same).
https://www.amazon.com/gp/aw/d/B07D3SKTC6/ref=sspa_mw_detail_3?ie=UTF8&psc=1