Question

what is triangular slave trade? how it was developed and when it was abolished

Answer 1

The best-known triangular trading system is the transatlantic slave trade, that operated from the late 16th to early 19th centuries, carrying slaves, cash crops, and manufactured goods between West Africa, Caribbean or American colonies and the European colonial powers, with the northern colonies of British North.
In 1787, the Committee for the Abolition of the Slave Trade was formed. In 1807, after a huge campaign – the first mass public protest campaign in history – Parliament abolished the slave trade.

Answer 2

The French colonies in Caribbean, such as Martinique, Guadeloupe and San Domingo are important suppliers of Tobacco, indigo, sugar, and coffee. There was a shortage of labour in the colonies which was met by a Triangular slave trade between France, Africa, America.
Merchants sailed from the ports of Bordeaux and Nantes to Africa from where they purchased slaves which were sold to plantation owners in the Caribbean.
The national Assembly did not pass any law for the freedom of slaves because they did not want to make businessmen unhappy.
The convention made laws to free slaves in 1794 but Napoleon reintroduced slavery.
Slavery was finally abolished in French colonies in 1848.