Final answer:
The national Constitutional Convention method to propose amendments to the U.S. Constitution has never been used, with all 27 amendments instead being proposed through Congress.
Step-by-step explanation:
The national Constitutional Convention method to propose amendments to the Constitution has never been used. The process for proposing amendments includes two approaches: one involving Congress and the other a national convention called by two-thirds of the state legislatures. However, all 27 amendments, including the Bill of Rights, have been proposed by Congress and then ratified by the states.
Proposing an amendment through Congress requires a two-thirds majority in both the House of Representatives and the Senate, while ratification needs approval from three-quarters of the state legislatures. Despite the existence of the convention method, it has never been successfully invoked to propose an amendment. Over 10,000 amendments have been proposed throughout the history of the Constitution, but only a fraction has received the necessary support to even be considered for ratification.
Amending the Constitution is not an easy task, reflecting the document's strength and stability. Since the adoption of the Constitution, many amendments have been proposed to address various issues, but only 27 have successfully met the stringent requirements set forth in Article V of the Constitution.