The event in 1776 that symbolized the birth of a nation was the adoption of the Declaration of Independence. Drafted primarily by Thomas Jefferson, it asserted the colonies' intention to break away from British rule, articulating principles of liberty and self-government. This declaration was ratified on July 4, 1776, a date now celebrated as Independence Day in the United States. The document not only marked a significant political change but also inspired other movements for freedom and rights worldwide.