Final answer:
The Constitution became the supreme law of the land when A. 9 states ratified it, specifically after New Hampshire's ratification in 1788, which was key for its implementation and future constitutional change.
Step-by-step explanation:
The Constitution became the supreme law of the land when A.9 states ratified it.
The crucial point in the ratification process was when New Hampshire became the ninth state to approve the Constitution in 1788, as stated in Article VII, which required at least nine of the thirteen states to ratify the document for it to become law.
The addition of the Bill of Rights was a pivotal factor in securing the support of many who were initially skeptical, ensuring the Constitution's acceptance by the states.
The promise of a Bill of Rights appeased the Anti-Federalists who worried about the lack of individual protections against federal power.
Ultimately, this led to the successful ratification of the Constitution and set a precedent for future constitutional change.