Year 1790 (MDCCXC) was a common year starting on Friday (link will display the full calendar) of the Gregorian calendar and a common year starting on Tuesday of the 11-day slower Julian calendar.

Benjamin Franklin (January 17, 1706 [O.S. January 6, 1705] – April 17, 1790) was one of the Founding Fathers of the United States. A noted polymath, Franklin was a leading author, printer, political theorist, politician, postmaster, scientist, musician, inventor, satirist, civic activist, statesman, and diplomat. As a scientist, he was a major figure in the American Enlightenment and the history of physics for his discoveries and theories regarding electricity. He invented the lightning rod, bifocals, the Franklin stove, a carriage odometer, and the glass 'armonica'. He formed both the first public lending library in America and the first fire department in Pennsylvania.

Franklin earned the title of "The First American" for his early and indefatigable campaigning for colonial unity; as an author and spokesman in London for several colonies, then as the first United States Ambassador to France, he exemplified the emerging American nation. Franklin was foundational in defining the American ethos as a marriage of the practical and democratic values of thrift, hard work, education, community spirit, self-governing institutions, and opposition to authoritarianism both political and religious, with the scientific and tolerant values of the Enlightenment. In the words of historian Henry Steele Commager, "In a Franklin could be merged the virtues of Puritanism without its defects, the illumination of the Enlightenment without its heat." To Walter Isaacson, this makes Franklin "the most accomplished American of his age and the most influential in inventing the type of society America would become."

Adam Smith (baptised 16 June 1723 – 17 July 1790 [OS: 5 June 1723 – 17 July 1790]) was a Scottish social philosopher and a pioneer of political economy. One of the key figures of the Scottish Enlightenment, Smith is the author of The Principles Which Lead and Direct Philosophical Enquiries, Illustrated by the History of Astronomy, prior to 1758, The Theory of Moral Sentiments, 1759, and An Inquiry into the Nature and Causes of the Wealth of Nations, 1776. The latter, usually abbreviated as The Wealth of Nations, is considered his magnum opus and the first modern work of economics. It earned him an enormous reputation and would become one of the most influential works ever published. Smith is widely cited as the father of modern economics and capitalism and is still among the most influential thinkers in the field of economics today. In 2009, Smith was named among the 'Greatest Scots' of all time, in a vote run by Scottish television channel STV.

Smith studied social philosophy at the University of Glasgow and at Balliol College in the University of Oxford, where he was one of the first students to benefit from scholarships set up by his fellow Glaswegian John Snell. After graduating, he delivered a successful series of public lectures at Edinburgh, leading him to collaborate with David Hume during the Scottish Enlightenment. Smith obtained a professorship at Glasgow teaching moral philosophy, and during this time he wrote and published The Theory of Moral Sentiments. In his later life, he took a tutoring position that allowed him to travel throughout Europe, where he met other intellectual leaders of his day. Smith then returned home and spent the next ten years writing The Wealth of Nations, publishing it in 1776. He died in 1790 at the age of 67.