The Black Hills
In the Black Hills of South Dakota there are two huge monuments carved from mountains. One is the Mount Rushmore National Monument. It shows the faces of four American presidents: George Washington, Thomas Jefferson, Abraham Lincoln, and Theodore Roosevelt. The other is the Crazy Horse Monument. In progress since 1947, it will show the famous Sioux Indian leader on horseback. These two monuments are tributes to heroes of two cultures that clashed on the American continent. Some of the major clashes between these cultures occurred not far from the Black Hills of South Dakota.
Randee Falk: Spotlight on the USA; Oxford University Press, 1993, page 93