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Firstly, recommended modification is sent to a long deliberation in both the houses of Congress. After which 75% approval of both the Houses are sought. Next it is sent to the states where 75% of the states’ approval is obligatory.
Secondly, forming a convention in which 75% approval of the states’ legislature is required to amend the laws.
Many amendments were carried on till now but thousands of them were discussed in both the Houses of congress.