Articles of Confederation is the original constitution of the US, ratified in 1781. This document established the functions of the national government the United States. The Article of Confederations weakness was that it was to weak to enforce laws, so therefore had no power.
Constitution is the body of fundamental principles or established precedents according to which a state or other organization is acknowledged to be governed. For example, bill of rights, rules, regulations, and fundamental principles. "The constitution guarantees our rights"
Suffrage is the right to vote in public elections. Universal suffrage means everyone gets to vote, as opposed to only men, or property holders. The first time suffrage was demanded for women was because of the Civil War.