Question

why did these countries fight in world war 1

Answer 1

Germany and austria

Answer 2

It grew into a war involving 32 countries. The Allies included Britain, France, Russia, Italy and the United States. These countries fought against the Central Powers which included Germany, Austria-Hungary, Ottoman Empire and Bulgaria. ... After the assassination, Austria declared war on Serbia. simplest answer is that the immediate cause was the assassination of Franz Ferdinand, the archduke of Austria-Hungary. His death at the hands of Gavrilo Princip – a Serbian nationalist with ties to the secretive military group known as the Black Hand – propelled the major European military powers towards war.
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