Answer; The most important result of the Spanish American war was that it set up a colonial empire for the U.S. and set the U.S. on the road to empire.
Explanation; During the Spanish American War the United states emerged as a world power as a result of victory over Spain. The United states emerged as a world power, it gained possession of the Phillippines, Guam, and Puerto Rico.
The most important result of the Spanish American war was that it led to the United State acquiring a large amount of previously-owned Spanish territory, including Guam, Puerto Rico, and a large part of the Philippines.