Thomas Paine's 'Rights of Man' is a political pamphlet published in 1791 and 1792 that argues for individual rights, democracy, and the principles of the Enlightenment. Paine's work championed the idea of natural rights inherent to all individuals, suggesting that government should be based on the consent of the governed and aimed at protecting these rights. His ideas significantly influenced social reform movements in the 19th century, as well as the rise of nationalism, promoting the notion that nations should be built on liberty and equality for all citizens.