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Economy of the United States
The United States of America is the world's largest national economy, representing 22.4% of nominal global GDP and 16.6% of global GDP. The United States' GDP was estimated to be $17.555 trillion as of Q3 2014.
The U.S. is the world's largest producer of oil and natural gas. It is the second-largest trading nation in the world as well as the world's second largest manufacturer, representing a fifth of the global manufacturing output. Of the world's 500 largest companies, 128 are headquartered in the US.
The economic history of the United States has its roots in European settlements in the 16th, 17th, and 18th centuries. The American colonies went from marginally successful colonial economies to a small, independent farming economy, which in 1776 became the United States of America
From its emergence as an independent nation, the United States has encouraged science and innovation. As a result, the United States has been the birthplace of 161 of Britannica's 321 Greatest Inventions, including items such as the airplane, internet, microchip, laser, cellphone, refrigerator, email, microwave, personal computer,