| Term | Definition |
| Preamble | Introductory section of the Constitution that begins with "We the People" (clear expression of popular sovereignty). Lists 6 goals. |
| Amending the Constitution | STEP 1-Requires a 2/3 vote of the House and Senate or 2/3 of the state legislatures to propose the amendment. STEP 2-Requires 3/4 of the state legislatures or 3/4 of state conventions to RATIFY! |
| Elastic Clause | A nickname for Article I, Section VIII, Clause XVIII. It allows Congress to stretch powers. Sometimes called the "necessary and proper" clause. |
| Necessary and Proper Clause | Another nickname for the elastic clause |
| Article I, Section VIII, Clause XVIII | The official article, section and clause of the elastic clause. |
| Louisiana Purchase | Jefferson's famous application of the elastic clause that allowed him to buy land from France's Napoleon in 1803. |
| Article I, Section IX | where powers denied to Congress are located |
| Article I | article that deals with the legislative branch |
| Article II | article that deals with the executive branch |
| Article III | article that deals with the judicial branch |