Rebellion? Did the Southerners try to take over the federal government? I did not know that.
Actually, yes they did try to continue running the US national government, running no less than 3 candidates for president in 1860, as well as the usual slate of Democrat politicians for other offices.
Then also invaded Maryland, and Pennsylvania, not to mention US territory in Arizona, a raid in Vermont, and illegal usurpation of federal authority in various forts, custom houses and arsenals. A number of rebellious militia companies were formed in the District of Columbia, which posed a serious threat to the President’s inauguration until loyal officers demobilized the ones who refused to submit to proper authority.