The Preamble is the section of the U.S: Constitution that explains why it was written. The reason is that rit eflects the desire of the people to improve their living, and a better form of government that protects them from internal or external problems.
Article 5 of the Constitution: The Amendments.
The first ten Amendments were adopted in the same time, and together they are known as the Bill of Rights. There are 27 Amendtments in total