Spanish American War
War fought between the US and Spain in Cuba and the Philippines. It lasted less than 3 months and resulted in Cuba's independence as well as the US gaining Puerto Rico, Guam, and the Philippines.
World War 1
A war between the Allies (Russia, France, British Empire, United States,Serbia,and Belgium) and the Central Powers (Germany, Austria-Hungary, Ottoman Empire,and Bulgaria) from 1914 to 1918
World War 2
A war between the Allies (Great Britain, USA, Soviet Union, and Russia) and the Axis Powers (Germany, Italy, and Japan) between 1939 and 1945
The conflict between Communist North Korea and Non-Communist South Korea. The United Nations (led by the United States) helped South Korea and Soviet Union owned North Korea