Leif Erikson Day is celebrated on October 9 each year in the United States. It honors the Norse explorer Leif Erikson, who is believed to be the first European to set foot in North America around the year 1000 AD. The day recognizes his contributions to exploration and the Viking legacy. The observance of Leif Erikson Day began in the early 20th century, with the first official recognition by President Franklin D. Roosevelt in 1930. It serves as a reminder of the rich history of exploration and the cultural impact of the Vikings in North America.