Answer :
Nationalistic pride, Imperialism, and symbiotic relationships all contributed to the escalating tensions that would lead to war.
What are the actions that ignited a war?
The heir to the Austro-Hungarian crown, Archduke Franz Ferdinand, and his wife was killed on June 28, 1914, by a terrorist with support from Serbia.
A series of political, diplomatic, and military choices were made by Europe's leaders during the ensuing crisis that turned a small-scale struggle in southeast Europe into a world war.
On July 28, Austria-Hungary declared war on Serbia with support from Germany. France entered the conflict as a result of Russia's assistance to Serbia.
Russia and France both received wartime declarations from Germany on August 1.
Britain and its empire entered the war on August 4 as a result of Germany's violation of British and Belgian neutrality concerns over German dominance in Europe.
These behaviors are a reflection of the aspirations, concerns, and fears of the European powers.
The choice to go to war was decided in the context of rising nationalism, militarism, rivalries between empires, and the struggle for dominance and influence.
The leaders of Europe were prepared to wage war in order to protect or advance national interests, and their decisions were influenced by a variety of factors, including long- and short-term foreign policy objectives, domestic political pressures, previous crises, and the system of adversarial alliances that had evolved over the preceding 35 years.
Therefore, the two actions were nationalism and imperialism.
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