List everything you know about slavery, the Underground Rail Road, and the Civil War. 2 things about each. PLS HELP TIMED!!

"such has been the patient suffrence of these colonies; and such is now the necessity which constrains them to after their former systems of government. the history of the present king of great britain is a history of reapeated injuries and usurpations, all having in direct object the establishedment of an absolute tyranny over these states." which statement best describes the excerpt