Frederick Douglass vs Thomas Jefferson/Rap Meanings

When in the course of human events, it becomes necessary for a battle to commence,
====(Jefferson is referencing the famous Declaration of Independence — for which he was the primary author — which says, "When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another..." in saying that it has at this point become necessary to engage in a rap battle against Frederick Douglass.)====