•Why it earns a slot
Sold more copies per capita than any book in American history at the time it was published, and reading the actual argument shows why: it turns an abstract question of allegiance into a plain, itemized case.
Thomas Paine's January 1776 pamphlet argues that monarchy and hereditary rule have no basis in reason or scripture, that reconciliation with Britain is no longer worth pursuing, and that the American colonies already possess the resources and unity needed to declare independence and govern themselves, for which Paine sketches a concrete continental charter.
This distillation is written from the freely available original, which is always the better read when you have the time: gutenberg.org.