Presidency of Herbert Hoover in the context of "Stimson Doctrine"

The United States presidential library system is a nationwide network of 16 libraries administered by the Office of Presidential Libraries, which is part of the National Archives and Records Administration (NARA). These are repositories for preserving and making available the papers, records, collections and other historical materials of every president of the United States since Herbert Hoover, the 31st president from 1929 to 1933. In addition to the library services, museum exhibitions concerning the presidency are displayed.

Although recognized as having historical significance, before the mid-20th century presidential papers and effects were generally understood to be the private property of the president. Franklin D. Roosevelt (32nd president, 1933–1945) proposed to leave his papers to the public in a building donated by him on his Hyde Park, New York, estate. Since then, a series of laws established the public keeping of documents and the presidential library system. These laws now seek to create a public archive library for each presidential term, with NARA taking control of the library documents immediately upon expiration of a term of office. Additional provisions govern when the documents are made available to the public. While not sanctioned and maintained by NARA, libraries have also been organized for several presidents who preceded Hoover and the official start of the Presidential Library Office.

There have been as many as 48 recessions in the United States dating back to the Articles of Confederation, and although economists and historians dispute certain 19th-century recessions, the consensus view among economists and historians is that "the [cyclical] volatility of GNP and unemployment was greater before the Great Depression than it has been since the end of World War II." Cycles in the country's agricultural production, industrial production, consumption, business investment, and the health of the banking industry contribute to these declines. U.S. recessions have increasingly affected economies on a worldwide scale, especially as countries' economies become more intertwined.

The unofficial beginning and ending dates of recessions in the United States have been defined by the National Bureau of Economic Research (NBER), an American private nonprofit research organization. The NBER defines a recession as "a significant decline in economic activity spread across the economy, lasting more than two quarters which is 6 months, normally visible in real gross domestic product (GDP), real income, employment, industrial production, and wholesale-retail sales".