What is the process for amending the U.S. Constitution?
A proposed amendment must pass Congress with the support of 67 percent of both the House and the Senate. Then it is referred to the states, where each state legislature must pass it. (Generally, the 67 percent rule applies there as well.) When 75 percent of the states have passed the amendment, the Constitution is altered. The founders of our country designed the system to be cumbersome so that it would be very difficult to change the original document and to ensure agreement among the majority of citizens.