Abolition of slavery became possible in France by the following ways:
(i) The slave trade began in the 18th century The National Assembly held long debates about whether the rights of man should be extended to all French subjects including those in the colonies.
(ii) Convention in 1794 legislated to free all slaves in the French overseas possessions.
(iii) However, Napoleon reintroduced slavery.
Finally slavery was abolished in 1848.