The United States National Academies comprises four organizations:

The National Academies serve (collectively) as the scientific national academy for the United States (US). The NAS, NAE, and IOM are honorary membership organizations, with a total membership of over 6,000 scientists, engineers, and health professionals. New members for each organization are elected annually by current members, based on their distinguished and continuing achievements in original research. The NRC is the "working arm" of the Academies, which serves to collect, analyze, and share information through studies and reports.

The National Academies produce independent recommendations and policy reports by enlisting top scientists, engineers, health professionals, and other experts (not limited to those in Academies membership) to address the scientific and technical aspects of some of society's problems. These experts volunteer to serve on study committees that are convened to answer specific sets of questions. All committee members serve without pay.

The National Academy of Sciences (NAS) is a corporation in the United States whose members serve pro bono as "advisers to the nation on science, engineering, and medicine." As a national academy, new members of the organization are elected annually by current members, based on their distinguished and continuing achievements in original research.

The National Academy of Sciences is part of the National Academies, which also includes:

The group holds a congressional charter under Title 36 of the United States Code.

The Act of Incorporation, signed by President Abraham Lincoln on March 3, 1863, created the National Academy of Sciences and named 50 charter members. Many of the original NAS came from the so-called Scientific Lazzaroni, an informal network of mostly physical scientists working in the vicinity of Cambridge, Massachusetts (circa 1850s).

In 1863, enlisting the support of Alexander Dallas Bache and Charles Henry Davis, a professional astronomer recently recalled from the Navy to Washington to head the Bureau of Navigation, Louis Agassiz and Benjamin Peirce planned the steps whereby the National Academy of Sciences was to be established. Senator Henry Wilson of Massachusetts was to name Agassiz to the Board of Regents of the Smithsonian.

The United States of America (commonly abbreviated to the United States, the U.S., the USA, America, and the States) is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwest of the continent, with Canada to the east and Russia to the west, across the Bering Strait. The state of Hawaii is an archipelago in the mid-Pacific. The country also possesses several territories in the Pacific and Caribbean.

At 3.79 million square miles (9.83 million km²) and with over 312 million people, the United States is the third or fourth largest country by total area, and the third largest by both land area and population. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The U.S. economy is the world's largest national economy, with an estimated 2011 GDP of $15.1 trillion (22% of nominal global GDP and over 19% of global GDP at purchasing-power parity). Per capita income is the world's sixth-highest.

A national academy is an organizational body, usually operating with state financial support and approval, that co-ordinates scholarly research activities and standards for academic disciplines, most frequently in the sciences but also the humanities. Typically the country's learned societies in individual disciplines will liaise with or be co-ordinated by the national academy. National academies play an important organizational role in academic exchanges and collaborations between countries.

The extent of official recognition of national academies varies between countries. In some cases they are explicitly or de facto an arm of government; in others, as in the United Kingdom, they are voluntary, non-profit bodies with which government has agreed to negotiate, and which may receive government financial support while retaining substantial independence. In the countries of the former Soviet Union, and in the People's Republic of China, the national academies have considerable power over policy and personnel in their areas. There is however a growing consensus among international federations of learned academies that bona fide national (or learned) academies need to adhere to certain criteria:

Arne Duncan (born November 6, 1964) is an American education administrator and currently United States Secretary of Education. Duncan previously served as CEO of the Chicago Public Schools.

Duncan was raised in Hyde Park, a Chicago neighborhood encompassing the University of Chicago. He is the son of Susan Goodrich (née Morton) and Starkey Davis Duncan, Jr. His father was a psychology professor at the university and his mother runs the Sue Duncan Children's Center, an after-school program primarily serving African-American youth in the nearby Kenwood neighborhood. His ancestry includes Norwegian, Scottish, German, Swedish, and English; his great-great-great-grandfather was U.S. Representative Milo Goodrich. While growing up, Duncan spent much of his free time at his mother's center tutoring or playing with students there. Some of his childhood friends were John W. Rogers, Jr., CEO of Ariel Capital Management (now Ariel Investments) and founder of the Ariel Community Academy, Illinois State Senator Kwame Raoul, actor Michael Clarke Duncan, singer R. Kelly and award winning martial artist Michelle Gordon.^{[citation needed]}