Why is james madison known as the father of the constitution?

Madison, wrote the Virginia Plan, the basis for the U.S. Constitution, he wrote 29 of the 85 Federalsit papers, political-advertisement for the Constitution,and he wrote the Bill of Rights, which protects our rights.

He contributed more ideas to the constitution than any other delagate

a. the astrolabe could determine the correct latitudinal location of the ship

the main reason that the constitution did not proclaim all men to be free and equal is because of the issue of slavery.