The yankees knew that having Southern men of honor, like Robert E. Lee, Nathan B. Forrest, and Jefferson Davis in the Union, was essential to its survival. The Yankee States, existing in a union without the Southern States, rightly seemed silly and unworkable to the Yankees. So they fought to keep them from leaving.
85 year prior to that,
King George knew that having American men of honor, like James Madison, George Washington, Thomas Jefferson, Benjamin Franklin and Alexander Hamilton, in the British Empire, was essential to its survival. The British, in an empire without the Americans, rightly seemed silly and unworkable. So he fought to keep them from leaving.
Southerners, however, knew that the CSA was destined to become the greatest nation on earth, and they knew that they didn't need New Englanders of the Kennedy and Rockefeller ilk in it, to become just that. Ahh - the spirit of independence; so American.
According to one of the affidavits of a CSA officer at Fort Pillow, Forrest shot in cold blood a mulatto servant of a federal officer. So much for him.
Lee ignored the words of his putative hero George Washington, who urged an immovable attachment to the national union. So much for him.
Jefferson Davis maintained that HIS government had the absolute right to coerce the states. So much for him.
Damn'd traitors, every one.