“The sectional compromises of the first half of the nineteenth century were not

“The sectional compromises of the first half of the nineteenth century were not in fact compromises but rather ‘sectional sellouts’ in which the North gave in to the insistent demands of the slaveholding South.”
Assess the validity of this statement.
Helpful hint:
Unlike many other prompts, the topic of this one is very specific: it focuses on three distinct compromises made concerning the issue of slavery in the territories. Those three compromises were the Missouri Compromise, the Compromise of 1850, and the Kansas-Nebraska Act. All three dealt, or attempted to deal, with slavery. For this prompt, examine each of these three compromises and determine whether or not the statement above is valid or not. As usual with a statement validation prompt, you can go all one way (the statement is entirely valid), all the other way (the statement is entirely invalid), or you can split the difference (the statement is valid in this way, but not in that way). Start with going through each of the compromises and look at the following:
What did it do?
Who did it benefit?