8500 XPS being sent to US and changing voltages

I purchased a Dell XPS 8500 in South Korea (220V) and may bring the desktop back to the US (110V).  Other than changing the power cord, is there anything else that I should do?  I read a thread where it indicated that I had to flip a voltage switch, but that thread was from a number of years back.  I was hoping that the voltages now automatically change to the country without any extra effort.  I also have a Dell monitor (U2312), but I believe that it is clear that the monitor will automatically adjust to the relevant country's voltage.  

Thank you in advance.