Where and When did the British slave trade begin in the new world?

1562  and the west coast of Africa

Explanation:

The transatlantic slave trade began during the 15th century when Portugal, and subsequently other European kingdoms, were finally able to expand overseas and reach Africa. The Portuguese first began to kidnap people from the west coast of Africa and to take those they enslaved back to Europe

its many islands, high mountains, and remote peninsulas isolated population centers.