When an amendment is ratified by two-thirds of Congress and three-fourths of state legislatures, it becomes part of the federal Constitution, and all states even those that did not ratify the amendment must follow the laws in the new amendment is True.
Step-by-step explanation:
Article V of the constitution defines and elaborate on the amendments process. It has been stated that an amendment can be made either by Congress with about two-thirds majority vote to be given in both representative houses and senate or by a two-thirds vote of the legislature of state called a constitutional convention.
After a long procedure, Proposed amendment reaches for a final decision. Then it can only become a part of the constitution when it is ratified by the three-fourths of the states that means 38 out of 50.