The Missouri Compromise…doesn't exactly have any rhetoric or rhetorical devices.

It wasn't intended to convince anyone of anything, or to take a stand on an issue. The Compromise was intended to set down in law the decisions made after all of the stand-taking and persuasion had already happened.

Because of that, the Compromise is a fairly straightforward accounting of the end result of all that debate. It lays down the conditions under which Missouri would enter the Union, how its State Constitution would be constructed, and how the U.S. would handle the introduction of slave and free states going forward. All of the rhetoric was filtered out and we're left with just the results.