Annobón and Bioko had been relatively neglected by the Portuguese, who had focused instead on São Tomé; with the gradual abolition of the transatlantic slave trade in the first half of the 19th century, these lost much of their value to Spain.
Annobón and Bioko had been relatively ignored by the Portuguese, who had concentrated instead on São Tomé; as the transatlantic slave trade gradually ceased in the early 19th century, these lost much of their significance to Spain.