Remarks and Explanation of the Great Seal by Charles Thomson (June 20, 1782)
The shield (escutcheon) is composed of thirteen stripes that represent the several states joined into one solid compact, supporting the chief (top section of the shield) which unites the whole and represents Congress. The stripes are kept closely united by the chief and the chief depends upon that union and the strength resulting from it.
The motto E Pluribus Unum alludes to this union.
The shield is born on the breast of an American Eagle without any other supporters to denote that the United States of America ought to rely on their own virtue.
The olive branch and arrows denote the power of peace and war which is exclusively vested in Congress.
The constellation of thirteen stars denotes a new state taking its place and rank among other sovereign powers.
The pyramid signifies strength and duration.
The Eye over it and the motto Annuit Coeptis allude to the many signal interpositions of providence in favor of the American cause.
The date 1776 underneath is that of the Declaration of Independence and the words Novus Ordo Seclorum under it signify the beginning of the new American Era, which commences from that date.