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  arch duke franz ferdinand and his wife were assasinated
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  austria hungary declares war on serbia a month after the assasination of franz ferdinand and his wife
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  austria hungary invaded serbia
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  the war took its toll on the constitutional government. it becaame much weeker.
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  belgium refused to give up their land to germany
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  one of the 3 powers that were allying against the central powers.
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  joined the war with the largest army and grew even more later in the war.
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  germany was a central power during world war one.
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  the german embassador and enver pasher agreed on a secret treaty. this treaty was kept a secret during the war.
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  were allies with austria hungary and the german empire however they refused to fight with them during the war.
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  fought as allies with the central powers.
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  portugal remained neutral during world war 1
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  allied with the central powers and russia
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  neutral during the war