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%.
By 1860, there were about four million slaves in the United States. On April 16, 1862, Abraham Lincoln, who was the US president at the time, signed the Compensated Emancipation Act, which freed more than 3000 slaves in the District of Columbia.mancipation Day is a holiday in Washington DC to mark the anniversary of the signing of the Compensated Emancipation Act, which president Abraham Lincoln signed on April 16, 1862.