The US Constitution provides a framework of laws for how the country is run. Its flexibility gives us the ability to add amendments when needed, although the process is anything but easy, requiring a vote of two-thirds of congress plus ratification by three-quarters of the states. So far, we've added 27 of them. The first ten are referred to as the Bill of Rights, which address the reasons we broke away from British rule in the first place. The amendments you don't recall are the ones that only come up when there's a problem in the country that is covered by them (which is why we forget what the Third Amendment is- it never comes up). Amendments that come after the Bill of Rights read like a timeline of American history, marking the Civil War and its aftermath, women's suffrage, Prohibition, the Vietnam draft, etc. The Paint Explainer, who brought us a rundown of logical fallacies, goes over every amendment with a short explanation for each in only eight minutes. There's a one-minute skippable ad at 4:05. -via Laughing Squid