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The Louisiana Purchase dramatically expanded the geographical boundaries of the United States in 1803. President Thomas Jefferson negotiated the acquisition of over 828,000 square miles from France for $15 million. This vast territory, encompassing present-day Louisiana, Missouri, Arkansas, Iowa, Ok...
John Gibbon was an American surgeon best known for inventing the heart-lung machine, a device that revolutionized modern cardiac surgery. After decades of development, he successfully used the cardiopulmonary bypass machine in 1953 to perform the first successful open-heart surgery on a human patien...
Megalonyx jeffersonii, a North American ground sloth, was first described by Thomas Jefferson in 1797 and later formally named in his honor; it ranged across much of North America before disappearing at the end-Pleistocene extinction.
A Summary View of the Rights of British America is an influential political pamphlet drafted by Thomas Jefferson in 1774. Originally written as a set of instructions for the Virginia delegates to the First Continental Congress, it was widely circulated in published form. Jefferson argued that the Am...
