(words in italics were added to the US Constition by the Confederates; text in brackets was removed): "WE, the People of the [United States] Confederated States, each State acting in its sovereign and independent character, in order to form a [more perfect Union] permanent Federal government, establish Justice, insure domestic Tranquility [provide for the common defense, promote the general Welfare], and secure the Blessings of Liberty to ourselves and our Posterity, invoking the favor and guidance of Almighty God, do ordain and establish this Constitution for the [United] Confederate States of America." Read this excerpt from the Constitution of the Confederate States. On which event or issue can historians gain insight from this excerpt?