Constitution change is a process by which the Constitution of a country can be altered. This is usually done through an AMENDMENT, which is a formal proposal to change the existing document. Amendments are typically proposed by the government or by citizens, and must be approved by a majority of the people in order to become law. Amendments can be used to add new rights, modify existing laws, or even repeal existing laws. The Constitution of the United States has been amended 27 times since its adoption in 1787.