I'm doing some research and it looks like most modern computer power supplies support 100-240 VAC and 50-60Hz, which means they can be used in either US or Europe as long as you have a power cord that fits the local outlets. Does that sound right?
@phessler@annika It's interesting. I got curious as to what South America uses, and while the North American influence seems to reach Colombia, south of that is a bit more mixed. Brazil seems to be using both 110 and 220, a 60 Hz. That's really weird.