Final answer:
King George III's actions listed in the Declaration of Independence played a key role in the colonists' decision to fight for independence.
Step-by-step explanation:
The role of King George III in the colonists' decision to transform from loyal subjects into rebels fighting to defend their rights can be understood through the grievances listed in the Declaration of Independence. The document, primarily written by Thomas Jefferson, accused King George III of violating the colonists' rights by taxing them without their consent, interfering with their trade, denying them the right to trial by jury, and depriving them of their right to self-government. These actions by the king led the colonists to believe that independence was the only option to protect their liberties.