Who was one who's side?
Before WW1 the alliances were Japan and Britain, Britain, France and Belgium, Germany and Austria-Hungary, France, Russia and Serbia and Serbia and Russia. The war first began when a Serbian terrorist group assassinated Ferdidnand of Austria-Hungary. The assassination resulted in Austria-Hungary to declare war in Serbia then Russia got involved to defend Serbia. Germany then declared war on Russia so France was brought into the fighting. Germany first attacked France pulling Great Britain into the fight then later Japan, Italy and the Unites States joined.
One of the main alliances was the Triple Entente, it was the understanding linking the Russian Empire, the French Third Republic, Great Britain and Ireland. Another main alliance was the Triple Alliance also known as the Central Powers. It included Germany, Austria-Hungary and Italy and it started back in 1882 then ended after WW1. The purpose of this alliance was each country was committed to provide military support to the others. The Triple Entente formed when the foreign minister Sir Edward Grey negotiated Britain into the alliance and united three old enemies. The terms of the Entente does not state that each country go to war on behalf of the others, but it does obligate that they have to support each other.
One of the main alliances was the Triple Entente, it was the understanding linking the Russian Empire, the French Third Republic, Great Britain and Ireland. Another main alliance was the Triple Alliance also known as the Central Powers. It included Germany, Austria-Hungary and Italy and it started back in 1882 then ended after WW1. The purpose of this alliance was each country was committed to provide military support to the others. The Triple Entente formed when the foreign minister Sir Edward Grey negotiated Britain into the alliance and united three old enemies. The terms of the Entente does not state that each country go to war on behalf of the others, but it does obligate that they have to support each other.
This video covers the 5 major treaties and alliances that helped with the build up to the war. It introduces major leaders that helped from the alliances.