The United States Declaration of Independence was adopted in the year 1776. On July 4th of that year, the Continental Congress officially approved the document, which announced the thirteen American colonies' intention to separate from British rule. Authored primarily by Thomas Jefferson, the Declaration outlined the philosophical justification for independence, emphasizing principles such as individual rights, government by consent, and the pursuit of happiness. This historic document not only marked a pivotal moment in American history but also inspired democratic movements worldwide, signifying the colonies' commitment to establishing a government based on Enlightenment ideals.