How was Napoleon able to control the countries neighboring the French Empire?
Napoleon was able to control the countries neighboring the French Empire by setting up his family members as their rulers as well as by fragile alliances based on him otherwise threatening military action.
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Countries adjacent to the French Empire were Spain, the Grand Duchy of Warsaw, and numerous German kingdoms in Central Europe ruled by Napoleon.
He fought them and in a series of brilliant battles, he crushed the opponent and forced the other countries to sign peace treaties.