The Stamp Act of 1765 was the first internal tax put directly on American colonists by the British government. The act, which imposed a tax on all paper documents in the colonies, came at a time when the British Empire was deep in debt from the Seven Years' War. Arguing that only their own representative assemblies could tax them, the colonists insisted that the act was unconstitutional, and they resorted to mob violence to intimidate stamp collectors into resigning.