Components select non-free software, not non-US (page 166)
More...Reported on: 2006-01-26
In chapter 5. The Debian package management system on page 166:
The item on components on the top of page 166 states that components "also specify when non-US software is to be used."
This should say "non-free software" instead. Components cannot be used to select non-US software.