The Sons of Liberty formed in the American colonies in 1765 as a secret organization to resist British taxation and control, particularly in response to the Stamp Act. The British had accumulated massive war debt from the French and Indian War and imposed taxes on the colonies to help pay it off, including the Stamp Act, which required colonists to pay a tax on printed materials. The Sons of Liberty organized protests, demonstrations, and acts of defiance to oppose these taxes and the presence of British soldiers in the colonies, rallying around the motto "No taxation without representation." They used tactics such as public demonstrations, intimidation, and violence to resist British authority and played a significant role in escalating colonial resistance that eventually led to the American Revolution.