What was a requirement for the Constitution to go into effect after being signed?

The requirement for the Constitution to go into effect after being signed was ratification by the states. Following the Constitutional Convention in 1787, the delegates recognized that the new Constitution would not automatically take effect upon signing; instead, it needed to be ratified by nine out of the thirteen states in order to become the law of the land. This process emphasized the principle of federalism and the importance of state approval in the creation of a new government framework. Each state held conventions to debate and decide on the ratification, reflecting the democratic values that were central to the founding of the United States. Without this ratification process, the Constitution would not have had the legitimacy or authority to govern.

The other options, while relevant to the broader historical context, do not pertain to the immediate requirement for the Constitution's enactment. Approval from the British Parliament was irrelevant, as the United States had declared independence. The election of a president and the implementation of the Bill of Rights came later and were not conditions for the initial ratification of the Constitution itself.