Thomas Jefferson played a key role in the Declaration of Independence, serving as its principal author. Drafted in 1776, this document articulated the American colonies' desire to separate from British rule, asserting their natural rights to life, liberty, and the pursuit of happiness. Jefferson's eloquent prose and Enlightenment ideals were instrumental in shaping the revolutionary document, which articulated foundational principles of democracy and governance. The Declaration’s adoption marked a pivotal moment in history, establishing the United States' commitment to freedom and self-governance and galvanizing support for the American Revolution.