Who did European slave traders rely on to supply them with slaves?

Spain had to rely on Portuguese ships and sailors to bring slaves across the Atlantic. Around 1560 the Portuguese began a regular slave trade to Brazil. From 1580 till 1640 Portugal was temporarily united with Spain in the Iberian Union.Explanation:pl follow me pl mark as the brainilist answer

“in fact, mississippi was the only state to reject the amendment. the 24th amendment also gave congress power to enforce it. a year and a half later on august 6, 1965, the voting rights act was enacted and banned poll taxes in all u.s. elections.”