Final answer:
The central idea of the text 'Buffalo Soldiers in Hawaii' is the transition of the U.S. from domestic expansion to imperialism and military intervention. The text explores the Spanish-American War, racial division in the armed forces, and the experiences of African American soldiers overseas.
Step-by-step explanation:
The development of the central idea in the text 'Buffalo Soldiers in Hawaii' is best reflected in the transition of the United States from a focus on domestic expansion and conflict to a period of imperialism and military intervention in foreign lands. The text highlights the significance of the Spanish-American War in placing the U.S. on the world stage and the racial division within the American armed forces during this time. It also explores the experiences of African American soldiers, known as Buffalo Soldiers, in their service overseas, such as in the Philippines.