The explanatory note about the kind of information a source contains is called a(n)

It is called a citation which is also called as reference. A citation or reference identifies a source of information (uniquely). It is an article which usually has two parts: (1) each section of text is marked as an inline citation which is either based on or quoted from an outside source. the said inline citation may be a superscript footnote number or a short citation; and (2) list of full references which gives complete and formatted detail about the source which enables readers of the article can find it and verify it.

answer: secession

secession, as it applies to the outbreak of the american civil war, comprises the series of events that began on december 20, 1860, and extended through june 8 of the next year when eleven states in the lower and upper south severed their ties with the union. the first seven seceding states of the lower south set up a provisional government at montgomery, alabama. after hostilities began at fort sumter in charleston harbor on april 12, 1861, the border states of virginia, arkansas, tennessee, and north carolina joined the new government, which then moved its capital to richmond, virginia. the union was thus divided approximately on geographic lines. twenty-one northern and border states retained the style and title of the united states, while the eleven slave states adopted the nomenclature of the confederate states of america.

explanation: