I don't agree. Lincoln was simply one actor in a larger folly. Slavery was a fatal flaw in our system. Karma's a bitch, and we've been paying for a long, long time. The commies have used our African problem for decades as a means of demoralizing America and planting and growing the seeds of subversion. Just like the terrorists, they've exploited our weaknesses. States rights failed due to corruption. Now capitalism is in danger of the same fate. Corruption and greed open the door to opportunists to overthrow our institutions. Without morality, we're toast. And so, here we are, nice and toasty.
In reality, "it" started in the first Congress, during the Washington Administration. By the time Adams was president, it was truly a mess in the making. Partisanship, cronyism, no agreement on what is or isn't constitutional. The problem wasn't Lincoln. The problem was we the people. Still is. But hey, it was just an experiment. Maybe someday we'll get a chance to try again.
Have a listen to both Part A and B of "A Blueprint For Tomorrow"
A Blueprint For Tomorrow