People do not save and accumulate capital because there is interest. Interest is neither the impetus to saving nor the reward or the compensation granted for abstaining from immediate consumption. It is the ratio in the mutual valuation of present goods as against future goods.
The resurgent claim that the modern economy was built on slavery is yet another attempt to attack capitalism while also claiming "we are all to blame" for slavery. The slave owners of old tried a very similar tactic.
In 1986, eight governors threatened to veto deployments of state troops to Central America. Washington generals and politicians responded by further destroying state independence and the Second Amendment's militia clause.