James madison president nineteen amendments to congress why were only 10 approved

Only ten of James Madison amendments were approved BECAUSE ONLY TEN WAS RATIFIED BY THE STATES.
Before an amendment can become a law, it must be supported by at least two- third of the members of the house of representative and that of Senate. When an amendment has the required support it will be ratified and approved but an amendment which does not have the required support will be discarded.