How many people were in slavery back in 1619?

In 1619, it is estimated that there were about 12 million people enslaved and transported from Africa to the Americas over the course of the transatlantic slave trade. However, in that specific year, the first recorded arrival of enslaved Africans in English North America occurred when a group of about 20 individuals was brought to Virginia. The institution of slavery would grow significantly in the following decades, leading to millions being enslaved over the centuries.