In the mid-1800s, Spain experienced economic growth, political stabilization, and military revival, and the country began to sense that it again could be a great global power. In addition to its desire for international glory, Spain also was the only European country that continued to use slaves on plantations in Spanish-controlled Cuba and Puerto Rico. Historically, Spain never had close ties to Washington, D.C., and Spain's hard feelings increased as it lost Latin America to the United States in independence movements. Clearly, Spain shared many of the same feelings as the Confederate...