Napoleon governed the European territories that he conquered through the spread of new ideas and the creation of new institutions all around those places.
All of the areas that Napoleon conquered were ruled with Napoleonic codes. These codes became the basis of law that was used in the areas.
Some of the European countries used the codes as the legal basis for some of their laws.
Napoleon expanded his empire all around the European continent by waging wars and crusades against the people that opposed him.
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