If you mean what reason the parliament gave. The reason was they said the colonists should help pay for the French and Indian War.
They were called abolitionists. <span />
Because Gandhi also fought for discrimination
Each branch of government controls a certain aspect of the other.
Legislative can restrict the policies of the executive and judicial.
Judicial can strike down legislation deemed unconstitutional, and undo executive decisions through rulings on their constitutionality.
Executive Orders can bypass legislative channels for more efficient decision making, and can nominate if not alter the Supreme Court along with taking part in it's processes. ( Some of this is my own interpretation. )
