Presidency of Thomas Jefferson in the context of "Alien and Sedition Acts"

The Thomas Jefferson Building, also known as the Main Library, is the oldest of the Library of Congress buildings in Washington, D.C. Built between 1890 and 1897, it was initially known as the Library of Congress Building. In 1980, the building was named in honor of Thomas Jefferson (1743–1826), a Founding Father, the principal author of the Declaration of Independence, and the third U.S. president. In 1815, the purchase of Jefferson's book collection formed a core foundation for the library's collection.

The building is located on First Street, S.E. between Independence Avenue and East Capitol Street in the federal national capital city of Washington, D.C., across from the United States Capitol on Capitol Hill. It is adjacent to the library's additional buildings in the Library of Congress complex, the John Adams Building (built in the 1930s) across Second Street, and the James Madison Memorial Building (built in the 1970s) across Independence Avenue to the south.

The land which became the United States was inhabited by Native Americans for tens of thousands of years; their descendants include but may not be limited to 574 federally recognized tribes. The history of the present-day United States began in 1607 with the establishment of Jamestown in modern-day Virginia by settlers who arrived from the Kingdom of England, and the landing of the Mayflower by English pilgrims to Plymouth in 1620. In the late 15th century, European colonization began and largely decimated Indigenous societies through wars and epidemics. By the 1760s, the Thirteen Colonies, then part of British America and the Kingdom of Great Britain, were established. The Southern Colonies built an agricultural system on slave labor and enslaving millions from Africa. After the British victory over the Kingdom of France in the French and Indian Wars, Parliament imposed a series of taxes and issued the Intolerable Acts on the colonies in 1773, which were designed to end self-governance. Tensions between the colonies and British authorities subsequently intensified, leading to the Revolutionary War, which commenced with the Battles of Lexington and Concord on April 19, 1775. In June 1775, the Second Continental Congress established the Continental Army and unanimously selected George Washington as its commander-in-chief. The following year, on July 4, 1776, the Second Continental Congress unanimously declared its independence, issuing the Declaration of Independence. On September 3, 1783, in the Treaty of Paris, the British acknowledged the independence and sovereignty of the Thirteen Colonies, leading to the establishment of the United States. On September 17, 1787, the U.S. Constitution was signed by a majority of delegates, and was later ratified by the Thirteen Colonies, leading to the first modern U.S. government.

In the 1788-89 presidential election, Washington was elected the nation's first U.S. president. Along with his Treasury Secretary, Alexander Hamilton, Washington sought to create a relatively stronger central government than that favored by other founders, including Thomas Jefferson and James Madison. On March 4, 1789, the new nation debated, adopted, and ratified the U.S. Constitution, which is now the oldest and longest-standing written and codified national constitution in the world. In 1791, a Bill of Rights was added to guarantee inalienable rights. In 1803, Jefferson, then serving as the nation's third president, negotiated the Louisiana Purchase, which doubled the size of the country. Encouraged by available, inexpensive land, and the notion of manifest destiny, the country underwent westward expansion in a project of settler colonialism marked by a series of conflicts with the continent's indigenous inhabitants. The most notable advocate of manifest destiny was President James K. Polk, who annexed Texas in 1845, and declared war on Mexico the next year. An overwhelming U.S. victory in the Mexican-American War led to the Treaty of Guadalupe Hidalgo in 1848, where the U.S. acquired much of the American Southwest from Mexico. Whether or not slavery should be legal in the expanded territories was an issue of national contention, and led to increasing tensions over slavery.

The Burr conspiracy of 1805–1807, was a treasonous plot alleged to have been planned by American politician and former military officer Aaron Burr (1756–1836), in the years during and after his single term as the third vice president of the United States (1801–1805), during the presidential administration and first term of the third president Thomas Jefferson (1743–1826, served 1801–1809).

Burr was accused of attempting to use his international connections and support from a cabal of American planters, politicians, and United States Army officers to establish an independent country in the old federal Southwest Territory (1790–1796), south of the Ohio River (future states of Kentucky, Tennessee and the future federal Territories of later Mississippi Territory (1798–1817), and adjacent Alabama Territory), and east of the Mississippi River and north of the southern coast along the Gulf of Mexico; or to invade/conquer the newly acquired Louisiana Purchase of 1803, west of the Mississippi River, later organized as the Louisiana Territory (1804–1812), then divided into future 18th state of Louisiana and upper/northern portion as Missouri Territory (1812–1821); or plotting against the northern parts of the colonial New Spain (later Mexico), still held by Spain; or against and seizing the Florida peninsula of the longtime Royal Spanish colony of Spanish Florida (consisting of West Florida and East Florida), in the Americas/Western Hemisphere, part of the world-wide Spanish Empire since the early 16th century.

An Ordinance of Secession is the name given to multiple resolutions drafted and ratified in 1860 and 1861, at or near the beginning of the American Civil War, by which each seceding Southern slave-holding state or territory formally declared secession from the United States. South Carolina, Mississippi, Georgia, and Texas also issued separate documents purporting to justify secession.

Adherents of the Union side in the Civil War regarded secession as illegal by any means and President Abraham Lincoln, drawing in part on the legacy of President Andrew Jackson, regarded it as his job to preserve the Union by force if necessary. However, President James Buchanan, in his State of the Union Address of December 3, 1860, stated that the Union rested only upon public opinion and that conciliation was its only legitimate means of preservation; President Thomas Jefferson had also suggested, after his presidency but in official correspondence in 1816, that the secession of some states might be desirable.

The Thomas Jefferson Memorial is a national memorial in Washington, D.C., built in honor of Thomas Jefferson, the principal author of the United States Declaration of Independence and the nation's third president. Built between 1939 and 1943, the memorial features multiple quotes from Jefferson intended to capture his ideology and philosophy, known as Jeffersonian democracy. Jefferson was widely considered among the most influential political minds of his era and one of the most consequential intellectual forces behind both the American Revolution and the American Enlightenment.

The Jefferson Memorial is built in neoclassical style and is situated in West Potomac Park on the shore of the Potomac River. It was designed by John Russell Pope, a New York City architect, and built by Philadelphia contractor John McShain. Construction on the memorial began in 1939 and was completed in 1943, though the bronze statue of Jefferson was not completed and added until four years after its dedication and opening, in 1947. Pope made references to the Roman Pantheon, whose designer was Apollodorus of Damascus, and to Jefferson's own design for the rotunda at the University of Virginia as inspirations for the memorial's aesthetics. The Jefferson Memorial and the White House form anchor points to the National Mall in Washington, D.C..