Answer:
two thirds of both Houses
Step-by-step explanation:
Since the ratification of the American constitution in 1789, there has been stipulated processes contained in its article V, on how the constitution would be amended anytime in the future. The article stipulates that two-third of both houses shall agree for the amendment of the constitution to take place, or the two thirds of the legislatures of several states. There has been over 27 amendments since the inception of these process.