Part of his strategy called for the acquisition of colonies in the Caribbean, which would serve as coaling and naval stations. This lasted until Columbus arrived in In , Antonio Mattei Lluberas and the local leaders of the independence movement in Yauco organized another uprising, which became known as the Intentona de Yauco. The local conservative political factions opposed independence. Slavers, which had made but few stops on the island before, began selling more enslaved Africans to growing sugar and coffee plantations. The Lares Revolutionary Flag Poverty and political estrangement with Spain led to a small but significant uprising in known as Grito de Lares. Some scholars suggest their settlement dates back about 4, years. By the end of the 16th century, the Spanish Empire was diminishing and, in the face of increasing raids from European competitors, the colonial administration throughout the Americas fell into a "bunker mentality". Even though the conspiracy was unsuccessful, Xiorro achieved legendary status and is part of Puerto Rico's folklore. With the advent of the lively Bourbon Dynasty in Spain in the s, the island of Puerto Rico began a gradual shift to more imperial attention. Rumors of the planned event spread to the local Spanish authorities who acted swiftly and put an end to what would be the last major uprising in the island to Spanish colonial rule. The upper house and governor were appointed by the United States. To increase its hold on its last two New World colonies, the Spanish Crown revived the Royal Decree of Graces of as a result of which , immigrants, mainly Spaniards, settled on the island in the period up until the American conquest. Meanwhile, in the island's interior, there developed a mixed and independent peasantry that relied on a subsistence economy. He then occupied the port and attacked the city while the population hurried for shelter behind the Morro's moat and high battlements. He later served as the first governor of the island.