What was the primary motivation for the United States' involvement in the Spanish-American War? To expand its global reach and demonstrate military power. To defend American citizens in Cuba. To support Cuban rebels fight for independence from Spain. To acquire Spanish colonies for economic exploitation.

The primary motivation for the United States' involvement in the Spanish-American War was to support Cuban rebels in their fight for independence from Spain. While other factors, such as the desire to expand global reach and demonstrate military power, played a role, the immediate cause was the Cuban struggle for independence.