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The Mississippian culture was a mound-building native American culture that flourished in what is now the Midwestern eastern, and South-eastern United States from approximately 800 CE to 1500 CE, varying regionally. The economic history of the United States has its roots in European colonisation in the 16th, 17th, and 18th centuries. Marginal colonial economies grew into thirteen small, independent farming economies, which joined together in 1776 to form the United States of America. The history of the United States traditionally starts with the declaration of independence in the year 1776, yet its territory was occupied first by the native Americans since prehistoric times and then also by European colonists who followed the voyages of Christopher Columbus starting in 1492. The United States emerged as a world economic and military power after 1890. Following World War I, the U.S. grew steadily in stature as an economic and military world power. During most of the 1920s, the United States enjoyed a period of unbalanced prosperity: farm prices and wages fell, while new industries and industrial profits grew. The boom was fueled by an inflated stock market, which later led to the stock market crash. This, along with many other economic factors, triggered a worldwide depression known as the great depression. During this time, the United States experienced deflation, unemployment soared and manufacturing output collapsed by one-third. During the period of World War II production book led to full employment, wiping out this vestige of the great depression. Indeed, labor shortages encouraged industry to look for new sources of workers, finding new roles for women and blacks. In 230 years the United States grew to a huge, integrated, industrialized economy that makes up over a quarter of the world economy.