The Köppen Climate Classification System is the most widely used system for classifying the world's climates. Its categories are based on the annual and monthly averages of temperature and precipitation. The Köppen system recognizes five major climatic types; each type is designated by a capital letter.
How, Why And When The United States Entered The War. Although many countries were drawn into the conflict of World War I, the United States maintained a policy of isolationism advocated by President Wilson.
