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The United States is a developed country has the world's largest economy by GDP, gaining from an abundance of natural resources and high worker productivity. The U.S.A economy is the post-industrial, the country continues to be like one of the world's largest manufacturers. Military spending 36% and 23% of the world GDP, it is the world's economic and military power, a famous political and cultural force, and a leader in innovations. In this paper, we study the correlation between GDP and unemployment rate, which the high rates of jobless, is causing by slow economic growth including recessions or depression, which measured by GDP. In return, unemployed workers have less to spend, which aggravate any slump. This downward cycle is very injurious, and best avoided. The applying will be on USA from 1929 until 2011 using regression and correlation analysis.