This act was passed to assert the authority of the British government to tax its subjects in North America after it repealed the much-hated Stamp Act. The Declaratory Act stated that Parliament could pass laws on the American colonies because its authority was the same in America as in Britain.On March 18, 1766, Parliament repealed the Stamp Act and passed the Declaratory Act. March 1766: Parliament issues the Declaratory Act, which states that the king and Parliament have full legislative power over the colonies. The Declaratory Act stated that Parliament had complete control over the governing of the colonies in "all cases whatsoever. In general the act is descryibed simply as a theoretical gesture or political tactic to ease the passage of the Stamp Act. The purpose of the Declaratory Act of 1766 was to affirm that Great Britain had complete authority to tax its American colonies. Image 10 of Debates on the Declaratory act and the repeal of the Stamp Act, 1766 568 Docunienls without Parlts. A mere four months after its enactment, the Stamp Act was repealed on March 18, 1766. The staple act of 1663- all imports to the colonies must go through. England.