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In page Atlantic slave trade:

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The first enslaved Africans to reach what would become the United States arrived in July[citation needed] 1526 as part of a Spanish attempt to colonize San Miguel de Gualdape. By November, the 300 Spanish colonists were reduced to 100, and their slaves from 100 to 70. The enslaved people revolted in 1526 and joined a nearby Native American tribe, while the Spanish abandoned the colony altogether (1527). The area of the future Colombia received its first enslaved people in 1533. El Salvador, Costa Rica, and Florida began their stints in the slave trade in 1541, 1563, and 1581, respectively. According to research, about 40 percent of enslaved Africans arrived at Gadsden's Wharf, which was the largest slave port in the United States.[1]