This document provides information about the 27 amendments to the US Constitution. It summarizes the key aspects of the 1st through 10th amendments related to individual rights and liberties. It then briefly outlines the 13th through 15th amendments addressing slavery and voting rights after the Civil War. The 16th through 19th amendments from the Progressive Era relating to taxation, popular election of senators, prohibition, and women's suffrage are noted. Further amendments regarding voting rights, presidential elections, terms and succession are listed along with the unique circumstances around the 11th, 21st, and 27th amendments. Informal amendments through legislation, executive action, court decisions and custom are also discussed.