The significance of the annexation of Hawaii for American imperialism lies in its strategic and economic implications. Acquired in 1898, Hawaii served as a critical refueling station for U.S. ships traveling to Asia, enhancing American military presence in the Pacific. Furthermore, its sugar plantations fueled the U.S. economy, providing a lucrative crop. The annexation reflected America's broader ambitions during the period of imperialism, as the U.S. sought to expand its influence across the Pacific. This move also marked a transition to a more interventionist foreign policy, setting the stage for future engagements in the region, including the Spanish-American War.