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The United States of America, commonly referred to as the United States (US) or America, is a federal republic composed of 50 states, the federal district of Washington, D.C., five major territories, and various possessions. The 48 contiguous states and Washington, DC, are in central North America between Canada and Mexico. The state of Alaska is in the northwestern part of North America and the state of Hawaii is an archipelago in the mid-Pacific. The territories are scattered about the Pacific Ocean and the Caribbean Sea. At 3.8 million square miles (9.9 million km2) and with over 320 million people, the country is the world's third largest by total area (fourth largest by land area) and the third most populous. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries.
The land area of the contiguous United States is 2,959,064 square miles. Alaska, separated from the contiguous United States by Canada, is the largest state at 663,268 square miles. Hawaii, occupying an archipelago in the central Pacific, southwest of North America, is 10,931 square miles in area. The populated territories of Puerto Rico, American Samoa, Guam, Northern Mariana Islands, and US Virgin Islands together cover 9,185 square miles.
The United States has been a leader in scientific research and technological innovation since the late 19th century. Methods for producing Interchangeable parts were developed by the U.S. War Department by the Federal Armories during the first half of the 19th century. This technology, along with the establishment of a machine tool industry, enabled the U.S. to have large scale manufacturing of sewing machines, bicycles and other items in the late 19th century and became known as the American system of manufacturing. Factory electrification in the early 20th century and introduction of the assembly line and other labor saving techniques created the system called mass production.
Veterinary science is the branch of science that deals with the prevention, diagnosis and treatment of disease, disorder and injury in non-human animals. United States is developing the research field in veterinary science day by day. The government is providing huge grants to do research work in the area of Veterinary science: list of Veterinary science journals United States, the researches and scholars are publishing their work in the united states Veterinary science journals list. People are benefited by the article published in Veterinary science journals United States; the researchers are finding solutions in list of Veterinary science journals. The scientist and researchers are providing the reference of Veterinary science journals.