Why is Gen. Albert Pike the only Confederate general with a statue on federal property in Washington, DC?

Albert Pike was born on December 29, 1809, in Boston, and was the oldest of six children born to Benjamin and Sarah Andrews Pike.  He studied at Harvard, and later served as a Brigadier-General in the Confederate Army. After the Civil War, Pike was found guilty of treason and jailed, only to be pardoned by fellow Freemason President Andrew Johnson on April 22, 1866, who met with him the next day at the White House. On June 20, 1867, Scottish Rite officials conferred upon Johnson the 4th to 32nd Freemasonry degrees, and he later went to Boston to dedicate a Masonic Temple.

Dang, I forgot to add the link: http://www.bibliotecapley...