What caused the Spanish to bring enslaved Africans to the Caribbean?

After European colonists occupied America and established plantations, they needed a lot of labor. Most people who worked in plantations and mines in the early days were white indentured laborers. They are poor immigrants from European countries who crossed the Atlantic. These people signed contracts with plantation owners or overseas labor service companies in their original places of residence and worked in the United States for several years to pay for their travel expenses. When the contract expired, they became free men. With the development of plantations, there was a serious shortage of labor, so European colonists had to find new sources of labor, and African blacks became their main targets for hunting labor. Using slave labor in plantations or mines is much cheaper and easier to manage than using white indentured workers. So the slave trade became a profitable business. The Portuguese and post-Spaniards were the first to engage in the slave trade. Slavers set sail from Europe and arrived in Africa, where they captured blacks by self-plunder, attacking black villages or forming alliances with hostile tribes. They transported slaves to wholesale slave markets in the Caribbean and then sold them to American planters.