They met in Philadelphia to strengthen the old Articles of Confederation. What they came out with was the new Constitution of the United States.
During the months they spent in Philadelphia, we know what happened only through notes of some of the participants, and through the Constitution they had agree on.
Their deliberations were secret - the public was not allowed in.
Speculate, if you would, on what would have happened had the meetings in Philadelphia been open to reporters, other politicians, lobbyists. Would they ever have reached agreement at all? Would the document have been considerably different from the one that they produced?
Would slavery have been enshrined in the document? Would two houses - one of equal representation and the other weighted toward population - have emerged? Would we have had a single executive or more? Might we have had a king? All those options were discussed, according to the notes.
If they had failed to reach an agreement, would we today be British colonies?