Well, this is a broad question, so I'm not quite sure what answer you're looking for, but the simplest answer, which used to get me confused, is: the monomer is a repeat unit of the polymer. Let's start by analyzing the words monomer and polymer. Mono = one, and poly = many. Now, lets go back to the science.
History of the United States with 150+ answers. According to one source: Twelve American presidents owned slaves, eight while serving in office, and at least 25 presidents count slave owners among their ancestors.. http://www.slate.com/articles/li... However, to put this into perspective this would be 37 that were either slave owners themselves or descended from slave owner ancestors - or 84%.
Slaves helped build White House, U.S. Capitol. WASHINGTON (CNN) -- In January, President-elect Barack Obama and his family will make history, becoming the first African-American first family to move into the White House -- a house with a history of slavery. In fact, the legacy of American presidents owning slaves goes all the way back to George Washington.