Why was president woodrow wilson concerned that united states might become divided as a result of world war 1 in 1914

Hurr. how did lincoln respond to the events at fort sumter? a)he called for the mobilization of troops to put an end to the rebellion. b)he signed an ordinance to dissolve the confederacy. c)he called for the seizure of federal property throughout the south. d)he declared the end of slavery in the united states.