Three momentous things symbolize the era that begins its cycle with the memorable year of 1776: the Declaration of Independence, the steam engine, and Adam Smith's book, "The Wealth of Nations." The Declaration gave birth to a new nation, whose millions of acres of free land were to shift the economic equilibrium of the world; the engine multiplied man's productivity a thousandfold and uprooted in a generation the customs of centuries; the book gave to statesmen a new view of economic affairs and profoundly influenced the course of international trade relations.