in 19th-century Ireland advocated Irish independence through repeal of the Acts of Union 1800. Many repeals without replacement are the result of significant changes in society. Major examples include: The old Jim Crow laws or blue laws in the US The Corn Laws in England, repealed in 1846 after a passionate campaign. Repeal of Prohibition in the United States. Enacted by the Eighteenth Amendment to the United States Constitution, prohibition of alcoholic beverages was repealed by the Twenty-first Amendment. This is the only constitutional amendment to have ever been repealed in the United States. The massive Statute Law Revision Act 2007 in the Republic of Ireland, through which 3,225 Acts were repealed, dating back over eight centuries to 1171 and the earliest laws enacted by England when it began its invasion of Ireland. The statutes repealed include a number of Acts of significant historical interest, including an Act of 1542 providing that the Kings of England shall be Kings of Ireland. This Act is the largest single repealing statute in the history of Ireland. Express or implied repeal The repeal of a statute may be either express or implied. Express repeal occurs where express words are used in a statute to repeal an earlier statute. They are now usually included in a table in a schedule to the statute, for reasons of convenience. In the United States, when a bill is passed by the House and Senate and signed by the president, or Congress overrides a presidential veto, the various provisions contained within the newly enacted law are rearranged according to their policy content and cataloged in the United States Code—a compilation of the general and permanent federal laws of the United States. To repeal any element of an enacted law, Congress must pass a new law containing repeal language and the codified statute's location in the U.S. Code (including the title, chapter, part, section, paragraph and clause). In this way, Congress (and the president) must follow the same rules and procedures for passing any law. When statutes are repealed, their text is simply deleted from the Code and replaced by a note summarizing what used to be there. Once deleted, the repealed statute no longer has the force of law. All repeals of parts of the US Code are, therefore, express repeals. Implied repeal occurs where two statutes are mutually inconsistent. The effect is that the later statute repeals