The Constitution is divided into three main parts: 1) The Preamble outlines the six main goals of the Constitution: forming a more perfect Union, establishing justice, ensuring domestic tranquility, providing for the common defense, promoting the general welfare, and securing liberty. 2) The Articles establish the framework of the government and are divided into seven sections. 3) The Amendments have changed the Constitution 27 times, with the first ten known as the Bill of Rights added in 1791.