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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 United States has high mountains in the West and a vast central plain, it is the world's fourth largest nation by total area. The coastal plain of the Atlantic seaboard gives way further inland to deciduous forests.
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. 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.
Agriculture is a major industry in the United States, which is a net exporter of food, it is particularly concentrated in the Great Plains, a vast expanse of flat, arable land in the center of the United States and in the region around the Great Lakes known as the Corn Belt.The United States is a leader in seed improvement i.e. hybridization and in expanding uses for crops. There is list of agriculture journals which can be referred to study recent developments like American Journal of Agricultural and Biological Sciences. Joachim Messing won nobel prize for innovations in recombinant DNA cloning, which revolutionized agriculture, and for deciphering the genetic codes of crop plants.