Question

why did slavery started in the French revolution

Answer 1

To basically criticise and have Labours work which their slaves will do!

Answer 2

There were many reasons. The bourgeoisie—merchants, manufacturers, professionals—had gained financial power but were excluded from political power. Those who were socially beneath them had very few rights, and most were also increasingly impoverished. The monarchy was no longer viewed as divinely ordained. When the king sought to increase the tax burden on the poor and expand it to classes that had previously been exempt, revolution became all but inevitable.