Portuguese.
Portuguese during the 1400's
The East African slave trade in the 1600 operated within Africa, Europe, and Asia, while the Atlantic slave trade in the 1700s also included in the Americans.
During the first Atlantic Slave Trade system most of these traders were Portuguese, giving them a near-monopoly during the era, although some Dutch, English, Spanish and French traders also participated in the slave trade. After the occupation, Portugal stayed formally autonomous, but was weakened, with its colonial empire being attacked by the Dutch and English. The Second Atlantic system was the trade of African slaves by mostly English, Brazilian, French and Dutch traders.
Europeans began to structure their economies around international trade during the Commercial Revolution.
Portuguese.
Prince John Henry
The African slave trade began around 1440. European countries shipped goods to African rulers who traded for slaves to be sent to the American continent. From America, slave-produced goods such as cotton, rum and molasses were shipped to Europe, completing this slave triangle. This continued into the 1700s.
The African slave trade started in the 1500's because of the need for laborers in Spain's American Empire.
The slave trade in America began in August 1619, when a Dutch privateer dropped anchor on the coasts of Virginia, landing and selling twenty "black servants" to the local dwellers.
Portuguese, Dutch then English
1619 by a Dutch slave trader
Kongo
Slavery began in the Virginia Colony in 1619.
When the Arab slave trade and the Atlantic trade began, many local slave systems changed and began supplying captives for slave markets outside of Africa.
Te Dutch east Indian trading company
Portuguese during the 1400's