James Madison. His extensive notes tell us about the Convention's proceedings. This is especially helpful as many of the key delegates died before the 30 year secrecy-pact expired, so we didn't get to hear what they had to say.
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The reason why the framers kept the proceedings of the Philadelphia convention a secret is because they feared that if people knew about their arguments they would not except the new constitution. Also if people new about their discussions they would not feel as free to discuss their ideas.
So the public couldn't put a stop to their plan to create a new constitution
Delegates wrote the United States Constitution (APEX)
The delegates elected George Washington to preside over the convention. The result of the Convention was the United States Constitution.
The Constitutional Convention adopted the Constitution in May 1787. The Constitution was adopted on September 17, 1787.