A repeal is the removal or reversal of a law. This is generally done when a law is no longer effective, or it's shown that a law is having far more negative consequences than were originally envisioned. Major repeals in history include: The repeal of the Act of Union 1800, providing for the union between Great Britain and Ireland as the United Kingdom. The union was partially repealed in 1922, when under the Anglo-Irish Treaty of 1921, twenty-six of the thirty-two Irish Counties became the Irish… (More on Repeal)