“Even more relevant is that prior to the Constitution the northern colonies had already outlawed slavery and expanded that abolition to the new territories being formed out west. Only the South continued the practice. And England had also already outlawed the practice.”
I don’t know what history you are talking about, but factually this is just about totally out of whack. The constitution was adopted in 1787, and at that point more than a few of the “northern” colonies still allowed slavery;some had banned new slaves but also allowed the ban to be phased in over a period of time, usually 25 years, and NY and NJ for example didn’t put in the ban until the end of the 18th/early 19th century. The Northwest ordinance of 1787 did ban slavery in what would become Ohio and some of the northwest states. England didn’t ban slavery until 1809…and while in 1808 the US finally banned the important of new slaves, it was not exactly enforced, either, new slaves were coming into the hemisphere under false prentenses and went from Cuba and other places to the US later on.
"Hence, after the Constitutional Convention and adoption of the Constitution. the slavery that existed as an institution in the South was a democrat created and controlled institution because the rest of the United States had already outlawed that activity. Jim Cow and the KKK were no different and were wholly democrat created institutions, as those practices were outlawed in the rest of the United States.
That is simplifying this to the Nth degree, and it is the old dodge of using the past to excuse the present. First of all, while the Democrats were heavily tied up with slavery, there were Democrats who opposed it (for example, in the north, Tammany Hall and similar Democratic machines, places like Boston, Chicago, were vehemently anti slavery, for the very reason they feared slave labor and what it would do to jobs in those places, especially if the south industrialized. On the other hand, they weren’t exactly racial pioneers either, they also feared the freed slaves coming north and taking jobs from the people already there…
The other problem with this is the old Whig party, which the GOP replaced just before the Civil War, was rent by slavery, it is the issue that caused it to fall apart, and the GOP that formed was primary those who opposed slavery, which also drew I might add more than a few anti slavery Democrats to it. Post the Civil war the Democratic party was not one party, so calling it the party of Jim Crow and the KKK is playing with semantics to prove a point…you can’t argue that the northern Democratic party of the cities and such were the party of the KKK or Jim Crow, rather you can argue that they weren’t going to challenge Jim Crow or the KKK either, since this was a needed part of their coalition (Mencken called the farm populists, jim Crow southerners and so forth the KKK branch of the Democratic party). On the other hand, once reconstruction had ended, the GOP never did much to end Jim Crow or the influence of the KKK either, neither party wanted to upset the apple cart and didn’t shrug.
I bring that up, not to diverge the topic, but to show how historical "truths’ have nuances that need to be discussed. The black and white “Democrats=slavery and the Jim Crow South” fails to indicate that not all the Democrats were pro slavery or pro Jim Crow, but didn’t do anything for political expediency, nor does it point out that the post Civil War GOP with its emphasis on business, was not exactly the ‘radical republicans’ of the post Civil war period, it is why it needs to be discussed.