Had the 15 slave states all remained in the Union, to this day, in 2015, it would be impossible to end slavery by constitutional amendment, since in a 50-state union, it takes just 13 states to block an amendment. [Emphasis mine.]This assumes, of course, that there would be 13 states that would block an amendment to end slavery (in 2015). And that assumes, of course, slavery would had continued to exist in the most advanced nation in the world. Frankly, I find the notion preposterous. Does anyone really believe that there would be 13 states in 2015 that would block an amendment to end slavery? Regardless, does anyone really believe that slavery would have survived in the U.S. over the last 150 years? Apparently, yes. I think the problem with that view is multifaceted (to say the least), but what I'm really finding difficult to comprehend is how one must view their fellow Americans in order to be able to come to that conclusion.
There's not a nation in the world where slavery (legally) exists today, but we're to believe the U.S. would be the lone one? Really? Suffice it to say I'm unconvinced.