The assassination of Arch Duke Franz Ferdinand, GavriloPrincip a Serbian man assassinated Ferdinand and his wife. This angeredAustria which led to them invadingSerbia.
causes of WW1
Imperialism - many Europeancountries had empires, which irritatedothercountries.
causes of WW1
Militarism - As Germany began to build up their army, many other countries felt threatened and pressured into building up their militarypowers.
causes of WW1
The Germaninvasion of Belgium marked the beginning of WW1 - Britain saw how poorly the Germans were treating the Belgians, which encouragedBritain to fightback as they had a strongalliance with Belgium.