None of what Lincoln achieved —
the eventual abolition of slavery, the preservation of the Union — would have happened had Lincoln not thought himself constitutionally authorizedto resist the Supreme Court's decision in Dred Scott; constitutionally obligated, by his oath, to resist secession; and constitutionally empowered, as commander in chief, to fight the enemy with the full powers at his disposal, which included military force, blockade, suspension of habeas corpus, arrest and detention, seizure of enemy property, and emancipation of Southern slaves.