The alliance system played an important role by leading to World War I, as countries that were in alliances with other countries were obligated to support their allies when war was declared.
In World War I, two major alliances faced each other. On the one hand, the Triple Alliance formed by the Central Powers: the German Empire and Austria-Hungary. Italy, which had been a member of the Triple Alliance together with Germany and Austria-Hungary, did not join the Central Powers, as Austria, against the agreed terms, was the aggressor nation that unleashed the conflict. On the other side was the Triple Entente, formed by the United Kingdom, France and the Russian Empire. Both alliances underwent changes and there were several nations that ended up entering the ranks of one or another side as the war progressed: Italy, the Empire of Japan and the United States joined the Triple Entente, while the Ottoman Empire and the Kingdom of Bulgaria joined the Central Powers.
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the will of the people with whom resides sovereign power".
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The big three formalized the plan to divide Germany into four zones of occupation.
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The northern borderlands of the Spanish colonies are now situated in the south of the United States. This place is rather dry and desertic compared with the center of Mexico, what used to be the heart of the colonies. They didn't have the means to make it productive land and produce crops, and didn't have the workforce either. Indians living there were nomadic and offered great resistance to Spanish subjugation, the opposite from the tribes living in the centre of Mexico, sedentarian and already used to the dominance of an empire, the Aztec one.
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