Wikimedia
Wikipedia: Columbus Day: Opposition to Columbus Celebrations
Read about the reasons many believe that Christopher Columbus should not be celebrated, namely his devastating impact upon native populations.
Other
Ann Arbor Times: Christopher Columbus: Hero or Villain?
Learn about why Columbus Day is considered a controversial holiday.
A&E Television
History.com: Columbus Day
This collection includes a description of the life and work of Christopher Columbus, along with a discussion of why Columbus Day is a controversial holiday. Includes video.