Final answer:
An amendment is a change to the Constitution of the United States and can be proposed by Congress or the states. It must be ratified by three-fourths of the state legislatures.
Step-by-step explanation:
An amendment is a change to the Constitution of the United States.
To amend the Constitution, there is a two-step process:
Step 1 - Proposing an Amendment
Two-thirds of both chambers of Congress must agree to propose an amendment. Alternatively, two-thirds of the states can call a convention to propose an amendment.
Step 2 - Ratifying an Amendment
Three-fourths of the state legislatures must agree to adopt the amendment for it to be ratified.