Obamas will make history as first African-American first family in White House . Slaves often worked seven days a week to build White House , U.S. Capitol . Twelve presidents owned slaves ; eight owned slaves while in office . `` It 's a very great and hopeful sign . '' Historian : http://en.wikipedia.org/wiki/File:President_Washington.svg
Obamas will make history as first African-American first family in White House . Slaves often worked seven days a week to build White House , U.S. Capitol . Twelve presidents owned slaves ; eight owned slaves while in office . Historian : http://en.wikipedia.org/wiki/File:President_Washington.svg