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The archduke of Ferdinand and his wife was assassinated by Gavrilo Princip in Sarajevo. -
Germany declares war on france because of previous alliances placed. -
Because Serbia failed to punish the people responsible for the death of the Archduke, Austria-Hungary declares war. -
Russia as a result of being called upon Serbia, joins the war. -
Germany declares war on Russia as a result of Russia mobilizing troops to help Serbia -
To try and quickly execute its war plan, Germany invaded belgium to get to france. -
Because germany invaded a neutral country, belgium, Great Britain declared war on Germany. -
A note from germany asking mexico to join to the, and in return the territories lost to the U.S. -
Due to the zimmermann note being intercepted, the U.S joined the war. -
To end the war America, France, and Britain same up with a treaty for Germany to sign and end the war.