How to cite when writing a paragraph in my history paper that is composed entirely of historical facts? Since almost everything I have found is something I pulled from a source, how do I write my essay without citing basically every single line? 

Edit: Yes, in my paper I am arguing something which will be said in my own words. I am writing a few paragraphs about the historical background of the situation, and that is where my question comes into play.
In addition to Pete's answer, I also want to mention that well-known historical facts generally do not require a citation.

For instance:


  The American Civil War was fought from 1861 to 1865.


This is well-known enough to be assumed as "general knowledge." On the other hand, 


  The average Pennsylvania farmer in the 18th century did not leave an estate worth 400 pounds, as de Crèvecoeur reports in his Letters from an American Farmer [citation needed].


is sufficiently obscure that it cannot get the same treatment.