When Columbus landed on San Salvador on October 12, 1492, he was sailing under the flag of King Ferdinand and Queen Isabella of Spain. This same flag would be used for many years as the succeeding Spanish explorers and colonists would help discover a new world.
The Conquistadores who carried this flag would use it as their symbol as they established dominion over Central America.
The Viking discovery of America had no apparent effect on the flow of history. It was under this flag that the European flow to America began.