Leif Erikson Day

Leif Erikson Day is a holiday that happens on October 9. It honors Leif Ericson, the Norse explorer who brought the first Europeans known to be in North America.
History.
"America Not Discovered by Columbus" by Rasmus B. Anderson was published in 1874. This book helped make popular the idea that Vikings were the first Europeans in the New World. In 1925, American President Calvin Coolidge recognised Leif Erikson as the Discoverer of America. This was due to research by Norwegian-American scholars such as Knut Gjerset and Ludvig Hektoen. 
In 1930, Wisconsin became the first state to officially adopt Leif Erikson Day as a state holiday. A year later, the state of Minnesota did the same. By 1956, Leif Erikson Day was an official holiday seven states (Wisconsin, Minnesota, South Dakota, Illinois, Colorado, Washington, and California) and one Canadian province (Saskatchewan). 
In 1963, the U.S. Representative from Duluth, John Blatnik, introduced a bill to observe Leif Erikson Day in the rest of the United States. In 1964, the United States Congress authorized and requested the President to create the observance through a yearly proclamation. Lyndon B. Johnson and each President since have done so. Presidents have used the proclamation to praise the spirit of discovery and the contributions of Americans of Nordic descent generally. Some states officially commemorate Leif Erikson Day, particularly in the Upper Midwest, where large numbers of people from the Nordic countries settled.
Date.
October 9th is not related with any event in Leif Erikson's life. The date was chosen because the ship "Restauration" coming from Stavanger, Norway, arrived in New York Harbor on October 9, 1825. This was the start of the first organized immigration from Norway to the United States.
Other websites.
Sample proclamations: