Which European explorer gave thanks in 1541, predating the Pilgrims' feast, near Palo Duro Canyon in modern-day Texas?

Francisco Vázquez de Coronado

Which country is famous for originating the Christmas tree tradition? Which NBA player is famous for the 'Skyhook' shot? What dairy product is the principal ingredient in tzatziki sauce? Who created the Game of Life, a popular cellular automaton? Who had a colorful vision about a stairway to heaven while sleeping on a stone pillow?