The principal author of the Declaration of Independence in the United States was Thomas Jefferson. Drafted in 1776, the document proclaimed the thirteen American colonies' intent to separate from British rule, citing numerous grievances against King George III. Jefferson's eloquent expression of Enlightenment ideals, emphasizing natural rights and the principles of liberty and democracy, made the Declaration a foundational text for American identity and governance. Its assertion that "all men are created equal" has inspired various civil rights movements throughout history and continues to have a profound impact on democratic ideals worldwide.