Greg Grandin

Even before the expansion of slave labor in the South and into the West, slavery was already an important source of northern profit, as was the already exploding slave trade in the Caribbean and South America. Banks capitalized the slave trade, and insurance companies underwrote it.

The question of causality is complex. For some philosophers and physicists, time might not exist. And since cause-and-effect reasoning needs the concept of time - of one thing preceding another - the effort to establish causality is a mug's game, an infinite regression of increasingly unanswerable questions.