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Our civil war was a long time coming, and a lot of people saw it coming. Some examples: South Carolina came close to seceding in the nullification crisis of 1828, the war in Kansas before it joined the Union, John Brown, the attack on senator Sumner in 1856. Whoever reads Uncle Tom's Cabin (published in 1852) will get a very strong sense of Harriet Stowe writing her novel to examine whether the South and North could remain within one country.
I wasn't around in the late '60s and early '70s, but from say mid-1968 through 1974, wasn't there much more reason to think that a civil war was coming than there is now?