Indigenous Peoples' Day is a holiday in the United States that celebrates and honors indigenous American peoples and commemorates their histories and cultures. It is celebrated across the United States on the second Monday in October, and is an official city and state holiday in various localities. It began as a counter-celebration held on the same day as the U.S. federal holiday of Columbus Day, which honors Italian explorer Christopher Columbus. Some people reject celebrating him, saying that he represents "the violent history of the colonization in the Western Hemisphere".