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in 1870, Bismarck attempted to place a Hohenzollern prince on the throne in Spain.
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in 1873, the Three Emperors League, which tied Germany, Austria-Hungary and Russia to each other's aid in time of war.
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Russia's withdrawal five years later in 1878, leaving Bismarck with a new Dual Alliance with Austria-Hungary in 1879.
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Two years after Germany and Austria-Hungary concluded their agreement, Italy was brought into the fold with the signing of the Triple Alliance in 1881
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It was chiefly this moral obligation that drew Britain into the war in defence of France, although the British pretext was actually the terms of the largely forgotten 1839 Treaty of London that committed the British to defend Belgian neutrality (discarded by the Germans as "a scrap of paper" in 1914, when they asked Britain to ignore it).
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The Death of Ferdinand was the spark of the war.
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The people that killed Ferdinand was a secret socity called the Black Hand.
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Austria declared war on Serbia.
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All of the countrys Germany, USA, Russia, France, Austria, Brittian, Japan, Italy.
