Around 5,400 Americans died in the Spanish-American war, only 370 were from battle. What caused the deaths for the other 5,000+ soldiers?

The league of nations was found in 1919 to keep peace after world war l.but it failed to prevent world war ll in 1939,so in 1945 the nations of the world set up a new organization,the united state (un).since then, the un has encouraged international cooperation and worked to resolve conflict