Many countries in the New World and elsewhere celebrate the anniversary of Christopher Columbus's arrival in the Americas, which occurred on October 12, 1492, as an official holiday. The event is celebrated as Columbus Day in the United States, as Día de la Raza in many countries in Latin America, as Discovery Day in the Bahamas, as Día de la Hispanidad, Fiesta Nacional in Spain, Día del Respeto a la Diversidad Cultural (Day of Respect for Cultural Diversity) in Argentina and as Día de las Américas (Day of the Americas) in Uruguay. These holidays have been celebrated unofficially since the late 18th century, and officially in various areas since the early 20th century.
Source: http://en.wikipedia.org/wiki/Columbus_Day
In the United States, 12th October is Columbus Day. Christopher Columbus discovered the New World on 12th October 1492. The major celebration of the day takes place in New York City, where a huge parade is held.
