US Presidency
1861

The Constitution provides, and all the States have accepted the provision, that the United States shall guarantee to every State in this Union a republican form of government. But if a State may lawfully go out of the Union, having done so it may also discard the republican form of government; so that to prevent its going out is an indispensable means to the end of maintaining the guaranty mentioned; and when an end is lawful and obligatory the indispensable means to it are also lawful and obligatory. It was with the deepest regret that the Executive found the duty of employing the war power in defense of the Government forced upon him. He could but perform this duty or surrender the existence of the Government.