What is the reasoning behind lincoln's referring to the south as "the rebellion"? why does he continually use this term? be sure to use evidence from the text to support your answer

In this excerpt, Lincoln constantly refers to the South as "the rebellion." This serves several purposes. One of the most important ones is that by referring to the South as "the rebellion," Lincoln establishes that the North States are the ones adhering to the "Union" and therefore, the United States, while it is the Confederacy which wants to leave. Moreover, it addresses the fact that most of the slaves are located in the South, but are not considered "rebels" anymore. This shows that the real "enemies" of the Union are not Southerners, but white plantation owners who refuse to outlaw slavery.