It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
The study "compares the constitutions of countries in the Americas with presidential regimes...it provides a set of constitutional articles in a comparative framework organized by over 200 substantive themes such as human rights, decentralization, separation of powers and electoral systems." The site also offers a bibliography of reference materials on constitutional law in the Americas.