Germany sought an alliance with Austria-Hungary and Russia. France was angry with Germany for taking Alsace and Lorraine during the Franco-Prussian War.
Germany created a dual alliance, under which Austria-hungary agreed that each would help the other if either was attacked by Russia
Germany, Austria-Hungary and Italy became the triple alliance
Germany failed to renew a treaty with Russia. France found an ally in Russia.
Britain signed the Entente Cordiale with France
Britain, France and Russia made the triple Entente.
Austria took two Turkish Balkan provinces; Bosnia and Herzegovina.
The German Naval fleet was trapped in its ports, so the British navy’s main role was maintaining a blockade to prevent Germany from importing War materials. Germany retaliated by sending out U-Boats to sink allied shipping.
With most of Germany’s navy stuck in port, Germany was unable to defend its colonies and South-Africa took German South-west Africa, Australia took German New Guinea, and Japan took Germany’s pacific islands colonies and territory in China.
Assassination of the heir to the throne of the Austro-Hungarian Empire Archduke Franz Ferdinand and his wife, the Duchess Sophie in the Bosnian town of Sarajevo was the trigger for World War 1.
Austria presented Serbia with an ultimatum (a final set of demands backed by a threat). Austria knew Serbia would never agree to all the terms, but did agree to some.
Serbia accepted many of the demands and offered to discuss others but Austria proceeded to declare war.
Germany attacked France through Belgium
Germany declared war on Russia who was supporting Serbia
France stood by Russia and declared war on France.
Germany’s failed to attack France because of strong Belgian resistance. This delayed Germany’s advance and helped France and British forces to halt the Germans in northern France. Trench warfare began.
The Allies withdrawer from Gallipoli.
Russian forces captured Armenia from Turkey, Turkish soldiers massacred hundreds of thousands of Armenians – the ANZACS land at Gallipoli
Italy withdrew from the Triple alliance and joined the Allies. Allies consisted of Greece, Portugal, Romania, Japan, China, Brazil and the small countries of Central America.
Austrian and German troops overran Romania soon after it joined the Allies
America and United States joined the Allies
Revolution in Russia leads to Russian withdrawal from the war.