Answer:
This was the result of the convention (between the 9 and 13 states at the Constitutional Convention).
Step-by-step explanation:
The result of the convention was the formulation of the Constitution of the United States, putting the Convention between the most important developments in American history.
In September 1787, the Constitution of the United States of America was approved by 38 of the 41 representatives present after the convention. As prescribed by Article VII, the certificate would not become necessary till it was approved by nine of the 13 states.