The first map to use the name America is coming to the Library of Congress in Washington, D.C. It is buying the chart, drawn in 1507, for $10 million.
Sometimes called America's birth certificate, it's the only known copy of a map that historians say caused the hemisphere to be named for explorer Amerigo Vespucci instead of Columbus.
The library said a $500,000 down payment has been made to the owner, German Prince Johannes Waldburg-Wolfegg, in whose castle it was found in 1901. Historians had long thought it had been lost.
The map consists of 12 separate sheets, which, when put together, cover 36 square feet.