The Gettysburg Address<span>, Abraham </span>Lincoln's<span> most famous speech and one of the most quoted political speeches in United States history, was </span>delivered<span> at the dedication of the Soldiers' National Cemetery in </span>Gettysburg<span>, Pennsylvania, on November 19, 1863, during the American Civil War</span>
Whenever we look at a flat surface (a picture, a television screen) and assume we are looking at spaces and objects that have depth, we are accepting a set of visual signals that create an illusion of three dimensional space. 3D cues are so common today that we are almost unaware of them.
I believe that answer would be libraries <span />
They heavily rely on Trade and barter because trade was important for them in South America !
