What was an important result of the spanish american war

The question is too general. There can be many answers to it.

Here I share a good proposal.

The brief war fought against the Spanish Navy and land forces in 1898 established the United States as a global, major navy and military power. The war was fought in Cuba - the Caribbean - and in the Pacific.  If a century before the American governments were not willing to join wars among European powers and pursued a cautious diplomacy, full industrialization, territorial expansion and a fantastic growth of economic might made the United States a player in world affairs to be reckoned with a century later. That´s one of the most significative results of the Spanish-American War.

Explanation:

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.