What was NOT a result of the Transatlantic Slave Trade in Africa? the end of some African

What was NOT a result of the Transatlantic Slave Trade in Africa?

the end of some African kingdoms as European traders usurped their authority
a legacy of power that kept European imperialists away
massive loss of people and their labor with the removal of roughly 10 to 13 million Africans
demise of peace and security as villages were raided by slave traders