Article V spells out a few different ways in which the Constitution can be amended. One method—the one used for every amendment so far—is that Congress proposes an amendment to the states; the states must then decide whether to ratify the amendment. But in order for Congress to propose an amendment, two-thirds of each House of Congress must vote for it. And then three-quarters of the states must ratify the amendment before it is added to the Constitution. So if slightly more than one-third of the House of Representatives, or slightly more than one-third of the Senate, or thirteen out of the fifty states object to a proposal, it will not become an amendment by this route. In that way, a small minority of the country has the ability to prevent an amendment from being added to the Constitution.