Management has existed for thousands of years, as evidenced by large construction projects from the past that required planning and coordination like the Egyptian pyramids and Great Wall of China. These projects employed over 100,000 workers and lasted decades, implying the necessity of managers to direct labor. Other early examples of management include the Venetian Arsenal shipyards in the 14th-15th centuries. Two significant developments in modern management history were Adam Smith's publication of "The Wealth of Nations" in 1776, which advocated for the division of labor to increase productivity, and the Industrial Revolution from 1760-1840, when factories employing machines replaced manual labor in homes.