How many enslaved Africans were brought to the New world between 1526 and 1867 as part of the Atlantic slave trade?

In what year did the United States officially ban the importation of enslaved Africans 

Black people are not allowed to buy land 

All black people were free to claim citizenship 

No black person, free or enslaved, could claim U.S citizenship

The jurisdictional law that put Nelson Mandela in jail

Informal system of segregation deciding where blacks could live 

Slavery, slavery in Africa, the Caribbean, black history