The significant event that took place in 1776, which dramatically changed the course of American history, was the Declaration of Independence. On July 4, 1776, representatives from the thirteen American colonies adopted a document declaring their independence from British rule. This act was fueled by dissatisfaction with British taxation and lack of representation, leading to escalating tensions. The Declaration, primarily authored by Thomas Jefferson, articulated the colonies' grievances and their right to self-governance. This pivotal moment not only initiated the American Revolutionary War but also inspired democratic movements worldwide and established foundational principles of liberty and equality that resonate to this day.