reevaluation of Spanish society known as the Generation of '98. The United States meanwhile not only became a major power, but also gained several island possessions spanning the globe, which provoked rancorous debate over the wisdom of expansionism. Historical background Spain's attitude towards its colonies The combined problems arising from the Peninsular War (1807–1814), the loss of most of its colonies in the Americas in the early 19th-century Spanish American wars of independence, and three Carlist Wars (1832–1876) marked a low point for Spanish colonialism. Liberal Spanish elites like Antonio Cánovas del Castillo and Emilio Castelar offered new interpretations of the concept of "empire" to dovetail with the emerging Spanish nationalism. Cánovas made clear in an address to the University of Madrid in 1882 his view of the Spanish nation as based on shared cultural and linguistic elements—on both sides of the Atlantic—that tied Spain's territories together. Cánovas saw Spanish colonialism as more "benevolent" than that of other European colonial powers. The prevalent opinion in Spain before the war regarded the spreading of "civilization" and Christianity as Spain's main objective and contribution to the New World. The concept of cultural unity bestowed special significance on Cuba, which had been Spanish for almost four hundred years, and was viewed as an integral part of the Spanish nation. The focus on preserving the empire would have negative consequences for Spain's national pride in the aftermath of the Spanish–American War. American interest in the Caribbean In 1823, the fifth American President James Monroe (1758–1831, served 1817–25) enunciated the Monroe Doctrine, which stated that the United States would not tolerate further efforts by European governments to retake or expand their colonial holdings in the Americas or to interfere with the newly independent states in the hemisphere. The U.S. would, however, respect the status of the existing European colonies. Before the American Civil War (1861–1865), Southern interests attempted to have the United States purchase Cuba and convert it into a new slave state. The pro-slavery element proposed the Ostend Manifesto of 1854. Anti-slavery forces rejected it. After the American Civil War and Cuba's Ten Years' War, U.S. businessmen began monopolizing the devalued sugar markets in Cuba. In 1894, 90% of Cuba's total exports went to the United States, which also provided 40% of Cuba's imports. Cuba's total exports to the U.S. were almost twelve times larger than the export to Spain. U.S. business interests indicated