World War 1 involved all of the world powers at that time. They were divided into two groups: the Allies and the Central Powers. The Allies group mostly consisted of the United Kingdom, France, Russia, and Italy. The Central Powers were formed around Germany, the Ottoman Empire, and Austria-Hungary.
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The main cause of WW1 was the assassination of Archduke Franz Ferdinand.
main ones: Germany, austria, (italy)
The two main opponents did not fight each other directly.
Germany's main allies were Austria-Hungary, Bulgaria and the Ottoman Empire.
MP40 submachine gun by the germans Thompson by the americans ppsh-41 by the russians