The imaginary boundary that divided the atlantic ocean was

Line of Demarcation

Explanation:

The Line of Demarcation was an imaginary line that was settled by the Portuguese and Spanish that divided the world into two parts between these two nations. First, the line was defined by Pope Alexander VI in 1493 and it changed to have its more common definition in 1494 by the Treaty of Tordesillas. The line determined that Spain controlled the lands that were discovered west of the line and Portugal controlled new lands to the east.

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answer; (c) slaves brought to the americans from africa;