Berlin Decree
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The Berlin Decree was issued by Napoleon on November 21, 1806, following the French success against Prussia at the battle of Jena. The decree forbade the import of British goods into European countries allied with or dependent upon France, and installed the Continental System in Europe.
Its purpose was to enforce the Continental System by cutting the British off from any goods, hopefully starving them out during the war. However, it was more successful in alienating the U.S. role of neutrality.