Just as the formal abolition of the slave trade in 1830 had simply promoted a clandestine trade that lasted into the 20th century .
The abolition of slavery made no immediate change to the situation of the peasants in the minor states .
Just as the formal abolition of the slave trade in 1830 had simply promoted a clandestine trade that lasted into the 20th century , so the abolition of slavery made no immediate change to the situation of the peasants in the minor states .