Slavery is the first phase of colonialism and, although already present in earlier times, it achieves the greatest development during colonialism.
Estimates of the number of people enslaved in the course of centuries vary widely, but for Africa alone are between ten and one hundred million people (Joseph Ki-Zerbo (1977) History of Black Africa, Torino, Einaudi, p. 274).

Only in the nineteenth century, under the boost of the movement for the abolitionism, it will progressively be abolished.

For further information:

The Slave Route

Slavery in the West Indies in the 18th Century

Slavery in British North America

Britain, slavery and the trade in enslaved Africans

The atlantic slave trade and slave life in the Americas: a visual record

The Tubman Institute

The Trans-Atlantic Slave Trade Database

Welcome to Recovered Histories

The history of British slave ownership has been buried: now its scale can be revealed

Middle Passage Ceremonies and Port Markers Project

Legacies of British Slave-ownership

How African Slavery Civilized Britain

A fortune built on slavery: the Bright Family Papers and their journey from UK to Melbourne

The Danish West-Indies - Sources of history

The Great Dismal Swamp

The Treasury’s tweet shows slavery is still misunderstood

Freedom on the Move

Details of horrific first voyages in transatlantic slave trade revealed

Reckoning with Legacies of Slavery and Slave Trade

UK taxpayers were paying compensation to slave traders until 2015

Throne of Blood

A very English theft: how the countryside was taken from the public, using profits from slavery

Enslaved.org / Peoples of the Historical Slave Trade

Portugal confronts its role in the trans-Atlantic slave trade

What are the British monarchy’s historical links to slavery?