"Slavery, though imposed and maintained by violence, was a negotiated relationship First, even as they confronted one another, master and slave had to concede, however
grudgingly, a degree of legitimacy to the other [T]he web of interconnections between
master and slave necessitated a coexistence that fostered cooperation as well as
contestation. Second, because the circumstances of such contestation and cooperation
continually changed, slavery itself continually changed Slavery was never made, but
instead was continually remade, for power-no matter how great-was never absolute,
but always contingent."
Ira Berlin, historian, Many Thousands Gone: The First Two Centuries of Slavery in North
America, 1998
Which of the following contributed most to the increasing use of African slave labor in
North America during the 1600s and 1700s?