The Spanish-American War lasted only about ten weeks in 1898. However, the war had far-reaching effects for both the United States and Spain. Jump to: Background Suggestions for Teachers Additional Resources Historical Background Causes of the War The conflict had complex beginnings. By the 1890s, Cuba had unsuccessfully battled Spain for independence for many years. In 1895, the Cuban revolutionary José Marti led an expedition to the island, attempting to seize power from Spain. As a result of