If you were a collector of any item -- be it coins, paintings, or china -- how much would you be willing to fork over for one at auction? What about if you were a very wealthy collector? Dozens of rare documents from periods spanning 200 years of American history just went up for auction, with historical artifacts and original manuscripts fetching millions of dollars each. Among them were original copies of the Emancipation Proclamation and the 13th Amendment -- marking the first time the pair have been sold at the same time. The Emancipation Proclamation sold for a whopping $2.17 million and the 13th Amendment sold for a massive  $2.41 million . They are each among a handful of original copies that still exist and are being held in private hands. What's more, they each bear the original signatures of Abraham Lincoln, Secretary of State William Seward, and other prominent men of the day. Lincoln originally issued the order abolishing slavery in 1863, but the copy just...