The developments made in the Compromise of 1850 was the Fugitive-Slave law and the ban on the slave trade in the nation's capital. The Fugitive-Slave law was declared for runaway and captured slaves to be returned to their respective owners.
Since Southern blacks were not allowed to fight in the Civil War, they were able to contribute to the war effort by joining the army despite the rules against it. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
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The nation and the nationalism.
The Constitutional Convention was called because the federal government established by the Articles of Confederation was considered to be too weak to effectively deal with the young nation's issues. Officially, the purpose of the convention was to revise the Articles of Confederation. Many feel that this was a drastic understatement, and that the real goal of many of its key proponents was to replace the Articles of Confederation and create a strong federal government.