[["Per IWM dot org, over 30 nations declared war between 1914 & 1918. The majority joined on the Allies side, including Serbia, Russia, France, Britain, Italy & the United States. They were opposed by Germany, Austria-Hungary, Bulgaria & the Ottoman Empire, who together formed the Central Powers.", 32.0], ["The reason it was called a World War was because almost every country in the world was involved. Over 30 nations declared war between 1914 and 1918. Most were Allies, opposed by Germany, Austria-Hungary, Bulgaria and the Ottoman Empire or Axis.", 32.0]]
what country was involved in world war one
history