It is based on the principle of federalism, where power is shared between the federal government and state governments. The powers of the federal government have generally expanded greatly since the Civil War.
The death of Caesar on the Ides of March sent the Roman Republic into a crisis that ultimately led to its abolition and the emergence of the Imperial system.
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In order to control their large empire, the Romans developed important ideas about law and government. They developed the best army in the world at that time, and ruled by force. They had fine engineering, and built roads, cities, and outstanding buildings.
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Pemex is Mexico's state-owned petroleum company and, for decades, was the sole supplier of all commercial gasoline (petrol/diesel) stations in the country. Cantarell Field is the largest oil field in Mexico and one of the largest in the world producing.
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