What if the Atlantic slave trade scales up had gone differently?

Plantation demand drives mass forced transport of enslaved Africans across the Atlantic.

If it had gone differently: The plantation economy never finds its labour force; Atlantic colonies stay marginal.

1. 1780The Industrial Revolution, Growth stays flat and Malthusian; most people alive in 1900 live about as their great-grandparents did.
2. 1791The Haitian Revolution, No state is founded by the formerly enslaved; abolition loses its sharpest argument for decades.
3. 1861The American Civil War, The Union splits for good; there is no single continental United States to become the next century's dominant power.