How did the Founders agree about what was supposed to be in the final document (the Constitution). Please give me a detailed explanation.

The correct answer to this open question is the following.

The Founders agreed about what was supposed to be in the final document (the Constitution) during the famous Constitutional Convention celebrated in the city of Philadelphia, Pennsylvania, during the summer days of 1787.

During the Constitutional Convention, delegates from the different colonies met and discussed the new form of government needed for the United States. There were two clear views of government. Federalists like Alexander Hamilton, James Madison, and John Jay, supported the idea of having a strong central government. On the other hand, Antifederalists like Thomas Jefferson did not support that political vision and favored a simpler form of government in which people could have natural rights.

That is when James Madison drafted the Bill of Rights, the first ten amendments to the Constitution of the United States, and both, and both sides could reach an agreement.