What step marks the final decision of the colonists to end their relationship with England?

The final decision of the colonists to end their relationship with England was marked by the adoption of the Declaration of Independence on July 4, 1776. This document, primarily authored by Thomas Jefferson, outlined the colonies' grievances against King George III and articulated their desire for self-governance. It symbolized a formal break from British rule and the assertion of the colonies' rights to independence. The Declaration galvanized support for the Revolutionary War and unified the colonists in their fight for freedom.