FTP, name this measure repealed by the Kansas-Nebraska Act and declared unconstitutional under the Dred Scott decision, passed in March of 1820 under the leadership of Henry Clay.
A representative from New York proposed mandatory emancipation at age 25 as a condition of the state constitution.  While his amendment passed the House easily, the deadlocked Senate would admit no such restriction.  Illinois Senator Jesse Thomas's amendment implemented the provisions that would last thirty-four years.  A "second" one the next year, necessary to deal with the subject of free blacks in the legislature, was pushed through by a certain Kentuckian, admitting the 24th and 25th states to the Union. Thomas Jefferson spoke of it as a "firebell in the night" warning of the danger of disunion.  FTP, name this measure repealed by the Kansas-Nebraska Act and declared unconstitutional under the Dred Scott decision, passed in March of 1820 under the leadership of Henry Clay.
A representative from New York proposed mandatory emancipation at age 25 as a condition of the state constitution.  
the Missouri Compromise