In it, he invoked the principles of human equality contained in the Declaration of Independence and connected the sacrifices of the Civil War with the desire for “a new birth of freedom,” as well as the all-important preservation of the Union created in 1776 and its ideal of self-government.
D - the people who are governed are the source of government power.
In the line in the second paragraph 'deriving their just powers from the consent of the goverened' they are stating that it is the people who give the government their power.
