What does lincoln mean when he says soldiers gave "the last full measure of devotion"?

The people who came to the american colonies in the 17th century had already been exposed to the idea of limited government mainly to the phrase in the declaration of independence stating "that governments are instituted among men, deriving their just powers from the consent of the governed" illustrates the principle of

After the attacks of september 11, 2001, the united states demanded that

The segments shown below could form a triangle.