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The U.S. is a country of 50 states covering major part of North America, with Alaska in the extreme Northwest and Hawaii extending the nation’s presence into the Pacific Ocean. Major cities include New York, a global finance and culture center, and Washington, DC, the capital, both on the Atlantic Coast; Los Angeles, famed for filmmaking, on the Pacific Coast; and the Midwestern metropolis Chicago.
The US remains the world's most powerful nation state. Since the end of World War II, the economy has achieved relatively steady growth, low unemployment and inflation, and rapid advances in technology. In terms of Population USA is third largest. The United States has high mountains in the West and a vast central plain. The United States is the world's largest national economy and the second largest as per purchasing power parity (PPP).
The United States Constitution itself reflects the desire to encourage scientific creativity. It gives the United States Congress the power "to promote the progress of science and useful arts, by securing for limited times to authors and inventors the exclusive right to their respective writings and discoveries. This clause formed the basis for the U.S. patent and copyright systems, whereby creators of original art and technology would get a government granted monopoly, which after a limited period would become free to all citizens, thereby enriching the public domain. In Physiology, Medicine, Physics, Chemistry and Economics, USA has produced 335 Nobel laureates so far. Harvard School, Stanford University, Massachusetts Institute of Technology, Yale University, Columbia University, Cornell University and many more focuses toward scientific and technological advancements. Extensive research towards environment are also being carried out in the country and the same been funded by many agencies and Environmental research & Education foundation is a one to exemplify. The scientific content related to environmental issues can be found at many USA Environmental sciences journal online.